We concern ourselves here with the standard for determining a challenge to the continuing vitality of restrictive covenants on real property. This case involves a set of restrictive covenants, recorded in 1986, encumbering originally a 466 acre parcel of land (“the Property”) in Prince George’s County. The current parties to the covenants are the City of Bowie, Maryland (“the City”), an original covenantee, and MIE, Inc. (“MIE”), a successor covenantor and current owner of the remainder of the Property. MIE’s predecessor in title agreed with the City to a Declaration of Covenants (“the Covenants”) which limits the development of the Property to 14 permissible uses. Contemporaneous with entering into the Covenants, an *668 Annexation Agreement (“the Agreement”) also was executed with the City, bringing the affected parcel, then undeveloped, within the City’s corporate limits. The Agreement contemplated the development of a “science and technology, research and office park” on the Property, hopefully with the support of the University of Maryland.
MIE challenges the continuing vitality of the Covenants, principally on the basis that changes in circumstances since the recording of the Covenants obviates the purpose for the Covenants. The City counters that the Property may be, and is being, developed in accord with the Covenants. The Circuit Court for Prince George’s County upheld the continuing validity of the Covenants. The Court of Special Appeals, however, reversed the judgment of the trial court, concluding that the trial judge applied the wrong standard for determining the ongoing validity of restrictive covenants. We shall reverse the judgment of the intermediate appellate court and remand with directions to affirm the judgment of the Circuit Court.
I. FACTS
Although the record reveals considerable dispute between the parties as to the purpose of the Covenants imposed on the Property, there is little controversy regarding the generic formative history of the Covenants. Approximately twenty years ago, the corporate limits of the City were expanded as a result of the annexation 1 of the Property, located in the northeast quadrant of the intersection of U.S. Route 50 and Maryland Route 3/U.S. Route 301 in Prince George’s County. The annexation process was initiated in 1985 by the application of the then—owners of the Property, Carley Capital Group and the University of Maryland Foundation, Inc. (“the Developers”). An Annexation Agreement was executed on 19 August 1985 between the Developers and the City and recorded in the land records of Prince George’s County on 16 *669 January 1986. 2 In consideration for the annexation of the Property, the City agreed to extend roadways, water and storm water management, and other public facilities to the Property at a cost of $1 million to the City and $3 million worth of Tax Increment Financing bonds to be recouped by the City through a special taxing district planned for the Property. The Agreement obligated the Developers to “develop,” and the City to “fully support [ ] the development” of, the Property as “a science and technology, research and office park.” The Agreement referred generally to the Developers’ “current intention” to “improve the Property and to sell portions thereof for mixed use commercial development ... to be known as the ‘University of Maryland Science and Technology Center’ (although the [Developers] may change such name as it from time to time deems appropriate).... ”
On 19 December 1985, the Developers executed the Covenants in favor of the City, establishing a list of permitted uses for the Property. 3 The Covenants provided, in relevant part:
Uses permitted on the property shall be the following and no other:
1) Office buildings for science, technology, research and related issues;
2) Accessory buildings and uses, such as offices, laboratories, off-street parking, enclosed storage areas, convey- or systems, towers, and signs to serve a principal permitted use;
*670 3) administrative, executive and research facilities, including the following, subject to the provisions of Section 27-331 of the Prince George’s County Code:[ 4 ]
(i) banks, savings and loans associations, or other savings and/or lending establishments;
(ii) business and professional offices;
(in) communications offices (e.g., telephone, telegraph, and the like);
(iv) data processing
(v) public utility offices; and
(vi) research, development and testing laboratories, including testing facilities and equipment, and the manufacture and/or fabrication of the same incidental to such research and development;
4) convenience commercial establishments, including the following, to serve the principal users (and the employees thereof) on the Property, subject to the provisions of Section 27-331 of the Prince George[’]s County Code:
(i) barber and beauty shops;
(ii) medical and dental climes;
(in) commercial outlets engaged in the sale or display of items produced on the premises;
(iv) eating and drinking establishments;
(v) financial offices, such as banks or' lending agencies, the principal services of which will be rendered to the surrounding industrial establishments; and
(vi) laundry and dry cleaning pick-up stations;
5) bio-medical laboratories;
*671 6) hotels and motels, which may include convention facilities and reducing/exereise salons and health clubs;
7) institutional uses of an educational, medical, religious or research nature;
8) technological activities oriented to telecommunications products and systems, including satellite communications;
9) public and quasi-public uses of an educational or recreational nature;
10) public utility buildings and lines;
11) printing and publishing of newsletters, periodicals, and similar products and photostatting, blueprinting, or other photocopying establishments;
12) medical and dental laboratories;
13) radio and television broadcasting studios; and
14) on an interim basis, agricultural uses, including farming, horticulture and similar uses.
The Covenants were duly recorded in the land records of Prince George’s County in January 1986.
It appears that the impetus for annexing the Property and the execution of the Covenants was for the Developers to gain the City’s infrastructure and political support for the development o f a high-technology research park on the Property. As the Developers and the City originally conceived, the affiliation of the University of Maryland was viewed as a vital component to the hoped-for success of the research park concept, as most such existing parks generally had some association with a research university as a means of attracting tenants. Unfortunately, the level of success expected for development of the Property did not materialize readily and, around 1999, the University of Maryland Foundation, Inc. completely extricated itself from the development project for financial reasons. Carley Capital Group, the other developer, contemporaneously filed for bankruptcy.
*672 Ownership of the Property changed several times since 1985; 5 however, the terms of both instruments remained undisturbed in the main. 6 Eventually, around 2000, MIE and its related entities became the owners of the remaining portions of the Property and began developing part of it with 150,000 square feet of “flex-space” buildings to accommodate various tenants. In 2001, MIE leased a portion of this space to C & C Dance Studio (“the Dance Studio”), a use which the City contended was in violation of the Covenants. MIE countered that the City previously had approved of the Dance Studio’s tenancy, but reneged on that approval in retribution for MIE’s refusal to construct a large, multi-story office building on the Property requested by the City. The City commenced this litigation to prevent the Dance Studio’s further use of its leased space.
II, PROCEDURAL HISTORY
The City filed on 24 October 2002 a complaint in the Circuit Court for Prince George’s County seeking a declaration that the Dance Studio’s use was in violation of the Agreement and Covenants and further requesting a permanent injunction against the continued use of the building space by the Dance Studio. After extensive discovery, MIE filed on 26 November 2003 a counterclaim for a declaratory judgment that the Covenants and portions of the Agreement restricting the permitted uses of the Property were invalid and unenforceable. A bench trial was conducted over the course of three *673 days beginning on 29 March 2004. The Circuit Court determined ultimately that the Covenants were valid and enforceable against MIE and that MIE had violated the Covenants by permitting the Dance Studio to use and occupy leased space on the Property, a use prohibited by the Covenants. Accordingly, the Circuit Court enjoined MIE from permitting the Dance Studio to use and occupy any space on the Property. MIE’s counterclaim was denied.
The Circuit Court reasoned that there had been “no radical change to the character of the neighborhood [of the Property] so as to defeat the purpose [ ] embodied in the Covenants and the Annexation Agreement.” The court was persuaded by the City’s expert witness, Alfred Blumberg II, 7 that the mixed-use development and zoning changes that occurred in the area surrounding the Property since 1985 did not render the Covenants’ purposes meaningless, but rather facilitated them. Having found the Covenants valid, the court concluded that the Dance Studio was prohibited by the Covenants. The court credited Blumberg’s testimony, over that of MIE’s expert, Thomas Kieffer, 8 that the Dance Studio, a private for-profit use, was inconsistent with the Covenants’ allowance for quasi-public and public educational uses.
Further, the primary purpose of the Covenants—the development of a science and research technology park—was found not to be dependent on the participation of the University of Maryland. Thus, the University’s withdrawal from the project was “not a deal breaker,” vitiating the purpose of the Covenant. The court was persuaded by the testimony of the City’s expert, Dr. Anirban Basu, 9 on the issue of the Covenants’ continuing vitality after the University’s withdrawal from the project. Dr. Basu’s testimony, when contrasted with that of MIE’s comparable expert, Dr. Darius Iranni, persuad *674 ed the court of various factual inadequacies in Dr. Iranni’s deposition testimony and a market analysis report prepared prior to his testimony. In particular, the court was troubled by the fact that Dr. Iranni apparently did not consider the Agreement or Covenants in forming his opinion on the “success” of the science and research technology park project. A subsequent report by Dr. Iranni addressing the change in circumstances evidently lacked a “significant factual predicate” for its conclusion that the University’s absence from the project was fatal to its success or potential success. Moreover, the court deemed persuasive the expert testimony of Dr. Stephen Fuller, a professor of public policy and economic development, who opined that the Covenants were not responsible for the failure of the project to advance as expected and that success was still attainable if only a proper marketing strategy were employed.
The Circuit Court also found that the City had not waived enforcement of the Covenants, even in view of its collateral extinguishment of the Covenants for two parcels of the Property conveyed to the federal government.
MIE filed a timely appeal to the Court of Special Appeals. It raised five questions for review, 10 alleging primarily that the Circuit Court erred by finding the Covenants valid and enforceable. Secondary arguments were tendered based on nonjoinder of an essential party (the Dance Studio), an assertedly unnecessary ruling on the Dance Studio’s noncompliance with *675 the underlying actual zoning classification of the Property, waiver by the City of the Covenants, and the City’s equivalent of the improper exercise of zoning power (tantamount to illegal “contract” zoning). In an unreported opinion, the intermediate appellate court disagreed with all of MIE’s secondary arguments, but held that the Circuit Court’s judgment that the Covenants were valid and enforceable must be vacated and the case remanded for further proceedings.
In those further proceedings, the Circuit Court would revisit the question of the Covenants’ validity vis-a-vis their purpose in light of a different standard than that applied originally by the Circuit Court. The Court of Special Appeals concluded that the continuing vitality of a restrictive covenant is determined by the “reasonable probability that the parties will be able to achieve the goals of the Covenants within a reasonable period of time.” 11 (emphasis added). Therefore, the panel of the intermediate appellate tribunal opined that the Circuit Court incorrectly “emphasized the theoretical possibility that the Maryland Science and Technology Center will be developed on the property” as the standard for determining the validity of the Covenants, (emphasis added). Thus, a remand was necessary to consider the facts under the “correct” legal standard.
The intermediate appellate court, with relative ease, disposed of the other questions raised by MIE. First, as to the *676 City’s failure to join the Dance Studio as a named defendant to its action, the court opined that the non-joinder was not a ground for reversal because the Dance Studio was aware sufficiently of the litigation related to its interest in its leased space on the Property, evidenced by the fact that the owner of the business testified at trial, effectively giving the Dance Studio its “day in court.” Second, the appellate court held that the trial court did not abuse its discretion in addressing the noncompliance of the Dance Studio’s use with the underlying actual zoning classification of the Property assigned by the County because MIE’s trial counsel essentially invited a ruling on that question during closing arguments. Third, although the appellate court was “not persuaded that the Circuit Court erred or abused its discretion in rejecting [MIE’s] waiver argument,” it nevertheless directed that the Circuit Court reexamine the issue on remand in light of events elapsing since judgment was entered by the trial court. Finally, the court held that the City’s enforcement of the Covenants, by virtue of the restrictions placed on the use of the Property, did not affront or usurp the zoning authority vested in Prince George’s County.
The City petitioned us for a writ of certiorari on the question of whether the Court of Special Appeals identified an incorrect standard for determining the continuing validity of the Covenants. MIE filed a Conditional Cross-Petition requesting that we review the remaining issues decided against it by the Court of Special Appeals. We granted both petitions.
III. STANDARD OF REVIEW
We review the factual findings of the Circuit Court for clear error, observing “due regard to the opportunity of the trial court to judge the credibility of the witnesses.” Maryland Rule 8-131(c). In addition, “we must consider the evidence in the light most favorable to the prevailing party and decide not whether the trial judge’s conclusions of fact were correct, but- only whether they were supported by a preponderance of the evidence.”
Colandrea v. Wilde Lake
*677
Cmty. Ass’n,
Review of the legal questions decided below is not so deferential. We examine
de novo
issues
of
law as decided based on the Circuit Court’s sustainable findings of fact.
In re Anthony W.,
We generally review the issuance of an injunction by a trial court for an abuse of discretion.
Colandrea,
IV. DISCUSSION
The existence of the Covenants is not disputed. In particular, MIE has not challenged the existence of the Covenants for want of a necessary legal element of a covenant that
*678
runs with the land.
12
County Comm’rs v. St. Charles Assocs. Ltd. P’ship,
A. The Legal Standard for Determining Challenges to the Ongoing Validity of Restrictive Covenants
The primary dispute in this ease is the proper legal standard for assessing the continuing vitality of a restrictive covenant that facially has perpetual existence. Before addressing that question directly, we first shall recount the manner in which restrictive covenants are read and interpreted generally by Maryland courts. In
Belleview Construction Co. v. Rugby Hall Community Ass’n,
In construing covenants, “[i]t is a cardinal principle ... that the court should be governed by the intention of the parties as it appears or is implied from the instrument itself.” The language of the instrument is properly “considered in connection with the object in view of the parties and the circumstances and conditions affecting the parties and the property____” This principle is consistent with the general law of contracts. If the meaning of the instrument is not clear from its terms, “the circumstances surrounding the execution of the instrument should be considered in arriving at the intention of the parties, and the apparent meaning and object of their stipulations should be gathered from all possible sources.”
If an ambiguity is present, and if that ambiguity is not clearly resolved by resort to extrinsic evidence, the general rule in favor of the unrestricted use of property will prevail and the ambiguity in a restriction will be resolved against the party seeking its enforcement. The rule of strict construction should not be employed, however, to defeat a restrictive covenant that is clear on its face, or is clear when considered in light of the surrounding circumstances.
The courts seem to have generally recognized that there is no public policy against a fair and reasonable construction, *680 in the light of surrounding circumstances, of restrictions designed, in general, to accomplish the same beneficial purposes as zoning. The courts, it would seem, are under a duty to effectuate rather than defeat an intention which is clear from the context, the objective sought to be accomplished by the restriction and from the result that would arise from a different construction.
(citations omitted). This explication of the method of construing restrictive covenants has been accepted as the standard in Maryland.
SDC 214, LLC v. London Towne Prop. Owners Ass’n,
The essential difference between the “competing” principles of construction is revealed when employed to construe an ambiguous restrictive covenant. Strict construction requires that an ambiguous covenant be read narrowly in favor of the free alienability and use of land without regard for extrinsic evidence bearing on the intent of the parties.
Steuart Transp. Co.,
Extrinsic evidence is only utilized when the intent of the parties and the purpose of a restrictive covenant cannot be divined from the actual language of the covenant in question, necessitating a reasonable interpretation of the language in light of the circumstances surrounding its adoption.
SDC 214, LLC,
1. The Purpose of the Covenants
As our cases direct, we begin our analysis of whether the Covenants in this case remain valid and enforceable with an examination of the Covenants’ purpose as indicat
*682
ed by their actual language.
SDC 214, LLC,
We conclude, as a matter of law, that the language of the Covenants and the companion Agreement is clear and unambiguous as to the intent of its parties. Contrary to MIE’s assertions, neither instrument requires the Property be developed in conjunction exclusively with the University of Maryland. Rather, the Agreement very clearly states that “[i]t is the current
intention
of the [Developers] to improve the Property and to sell portions thereof for mixed use commercial development....” (emphasis added). In its, later discussion of the City’s obligation to support the development of the Property, the Agreement referred to the project as “a science an d technology, research and office park,” again, without reference to the University of Maryland.
14
Indeed,
*683
the only reference to the University in either instrument was in the name to be bestowed on the development: “the University of Maryland Science and Technology Center,” which the Agreement states may be changed by the Developers as they deem appropriate. The intent of the parties and the purpose of the Covenant is clear: to develop a research park, with or without the involvement of the University of Maryland. Both the Agreement and the Covenants originally enumerated 14 permitted uses, each addressing that purpose. Had the Developers, MIE’s predecessors in title, wished to protect themselves from a perpetual restrictive covenant in order to account for certain contingencies (such as the withdrawal of the University of Maryland from the project or future unfavorable market conditions), they could have done so by including safeguards in the language of the Covenants. For whatever reason, no such precautions were undertaken and MIE assumed title to the Property subject to the Covenants. We may not invalidate a plainly written covenant to save a party from what may prove to be a poor business decision.
15
Higgins v. Barnes,
Even if the instruments were ambiguous, the Circuit Court was not clearly erroneous in its factual finding as to the purpose of the Covenants. 16 As discussed previously, we owe a great measure of deference to the factual findings of the Circuit Court. Thus, we do not overturn its findings of fact *684 absent clear error. We find no such error here. The trial judge was privy to the examination of several witnesses, both expert and lay, yielding extensive admitted testimony and other competent and relevant evidence as to the purpose of the Covenants. We do not second-guess the Circuit Court’s evaluation of the Covenants’ purpose given the trial court’s unique position to weigh the credibility of the evidence and testimony adduced at trial.
Moreover, we agree with the Court of Special Appeals’s rejection of MIE’s assignment of error that the Circuit Court improperly limited MIE’s ability to present its case by refusing to expand the number of days originally designated for trial. As a general proposition, “[t]rial judges have the widest discretion in the conduct of trials, and the exercise of that discretion should not be disturbed on appeal in the absence of clear abuse. Thus, ‘a trial judge maintains considerable latitude in controlling the conduct of a trial subject only to an abuse of discretion standard.’ ”
Tierco Md., Inc. v. Williams,
*685 2. The Continuing Vitality of the Covenants in Light of their Purpose
Once the proper existence and purpose of a restrictive covenant is established, the onus falls on the party seeking its annulment to demonstrate that, notwithstanding the clear purpose, the covenant should no longer be recognized as valid and enforceable. In determining whether the Covenants remain valid and enforceable in relation to their purpose, the Court of Special Appeals placed the burden on the City to prove “that there is a reasonable possibility that the Maryland Science and Technology Center will be developed on the property.” This was incorrect. The burden to prove the validity of a restrictive covenant devolves upon the claimed beneficiary of the restriction only “where [it is] not specifically expressed in a deed, to show by clear and satisfactory proof that the common grantor intended that [it] should affect the land retained as a part of a uniform general scheme of development.”
Steuart Transp. Co.,
The proper legal standard for this inquiry is to examine whether, after the passage of a reasonable period of time, the continuing validity of the covenant cannot further the purpose for which it was formed in light of changed relevant circumstances. The intermediate appellate court looked to the eminent domain case of
State Roads Commission v. Kamins,
*686
First, the intermediate appellate court adopted (wrongly) a standard applicable to eminent domain cases which does not translate so readily to the analysis of covenants because of the distinct objectives inherent to each. We alluded, in
Rogers v. State Roads Comm’n,
The objectives of covenant law are better served by the standard we announce today. The standard of changed circumstances restores the goal of objectivity in evaluating the ongoing validity of covenants by linking the result to objective factors outside of the property owner’s control. In this way, the “changed circumstance” standard for covenant analysis achieves an outcome similar to that achieved by the “reasonable probability” standard for eminent domain cases.
Second, the intermediate appellate court apparently misconceived the operation of the rule of reasonable construction of restrictive covenants by subjecting every aspect of such covenants, including their validity, to a reasonableness inquiry. Specifically, the court applied a rule meant to ascertain the intent of the parties to a covenant (its construction) to determine its continuing validity by evaluating the reasonable chances of accomplishing its purpose. This is not the intended application of the reasonable construction rule. Because we believe that this is the standard that the Circuit Court applied, reaching a correct result, we agree with the trial court’s finding that the Covenants remain valid and enforceable.
Our cases establish that chief among the factors considered in evaluating the present circumstances relevant to determining the continuing validity of a restrictive covenant is whether there has been a “radical change in the neighborhood causing the restrictions to outlive their usefulness.”
Chevy Chase Village v. Jaggers,
A dramatic change in the character of a neighborhood, though, is not the only circumstance to be considered. In some cases, the covenantee no longer exists, thus defeating the purpose of the covenant. See, e.g.,
Whitmarsh,
Importantly, the particular state of affairs bearing on the potential for a covenant to fulfill its purpose must be
*689
viewed with respect to the passage of time. Generally, if an unambiguous covenant specifies its duration for a time certain, then courts should hold the parties to their bargain.
Calomiris v. Woods,
While the cases referred to above reflect that Maryland courts have invalidated some restrictive covenants at vintages as young as 20 to 50 years, we caution parties bound by such agreements against challenging perennially their validity in hopes that some bright line expiration date has been reached. We are not speaking of perishable food items here. The passage of time alone does not evidence decay in this scenario. It is not necessarily so that the validity usually of
*691
covenants are compromised with each passing year. Rather, the question of validity is a combination of a reasonable period of elapsed time and frustration of purpose in light of changed circumstances occurring over that time. To that point, we note that those covenants invalidated in our cases 20 to 50 years after their creation differed substantially from their upheld counterparts because of the extent of the change in circumstances that had occurred in the former, completely frustrating the purpose of the covenant.
Compare Esso,
In the present case, at the time of trial in March 2004, approximately 19 years had passed since the Covenants were executed in December 1985.
19
We find no error in the Circuit Court’s determination that “[t]here has been no radical change to the character of the neighborhood so as to defeat the purpose [ ] embodied in the Covenants and the Annexation Agreement.”
20
We do not disturb a trial court’s findings of fact on the question of changed circumstances absent clear error.
Steuart Transp. Co.,
B. Enforcement of the Covenants by the City does not Constitute Illegal Contract Zoning
MIE claims that the imposition of the Covenants in connection with its annexation of the Property constitutes a sort of illegal contract zoning by a municipality, contrary to
*693
our decision in
Mayor & Council of Rockville v. Rylyns Enterprises, Inc.,
MIE asserts that, in a fashion similar to the City of Rockville’s actions in Rylyns, the City of Bowie has engaged in a form of illegal contract zoning, accomplished by the Covenants and Agreement with the Developers of the Property, in contravention of Prince George’s County’s zoning authority. As MIE’s theory goes, the County’s zoning prerogatives are disrupted because the Covenants prohibit a number of the uses permitted by the E-I-A zoning classification *694 initially assigned to the Property by the County. Since the time the Covenants were executed, Prince George’s County, under its zoning power exercised by the County Council in its capacity as the district council for that part of the county within the Regional District, 22 amended the E-I-A zoning district legislation to permit a “mixed use planned community.” 23 There was also a subsequent change granted in the zoning classification of the Property from E-I-A to M-X-T— Mixed Use, Transportation Oriented. Because these changes would permit the Dance Studio’s use on the Property, along with many other uses not contemplated by the Covenants, MIE argues that the Covenants “illegally impose land use limitations that are different from the County’s.”
MIE’s argument is without merit. First, we note that
Rylyns
dealt with a municipality invested with zoning authority, which is the only reason the prohibition on contract zoning was implicated. The City of Bowie possesses no such zoning authority,
24
so it has no zoning authority to contract away as did the City of Rockville in
Rylyns.
Contract zoning, which requires an agreement “between the
ultimate zoning authority
and the zoning applicant/property owner,” cannot take place when neither of the parties to the agreement is an “ultimate zoning authority.” Indeed, “[o]ur appellate cases consistently have held that it is the identity of the contracting parties that is the critical issue.”
Rylyns,
We were presented with a similar argument in
City of Greenbelt v. Bresler,
Furthermore, the City of Bowie is within its rights to attempt to address via covenants its concerns with the use of land within its municipal limits, should a land owner wish to be a party to such an agreement. The
Rylyns
Court pointed out that “Agreements between the landowner and governmental agencies who do not wield the final zoning authority or entities extrinsic to the formal zoning process ... may be permissible.”
Contrary to MIE’s assertions, covenants may be more restrictive than the zoning classification imposed by the external zoning authority. This is so because the covenants exist as independent controls on property.
Jaggers,
We are bound to interpret both the Covenants and the Agreement as written. The original parties to the Covenants and Agreement could have structured those instruments to permit the list of allowable uses to expand or contract with the uses allowed by the zoning classification established for the Property by the County. They did not. We may not add to the instruments that which the consenting parties neglected to bargain for in the course of their dealings.
*697 C. The City’s Alleged Waiver of the Covenants
MIE alternatively claims that it is not bound by the Covenants because the City waived its right to enforce the instrument. 25 This “waiver” argument is based on four grounds. First, MIE states that, prior to its acquisition of the Property, the City allowed several uses on the Property that were inconsistent with the Covenants’ restrictions. In particular, MIE cites as examples the operation of a sculpting studio and a private residence known as the “Melford House” on the Property. Second, MIE points to the City’s voluntary extinguishment of the Covenants as to two subdivided parcels of the Property on which buildings were constructed for the federal government’s Institute of Defense Analysis and Census Bureau. Third, it is asserted that representatives of the City manifested orally to MIE that the Covenants would not be enforced in the event that MIE purchased and developed the Property. Finally, after MIE purchased the property, it is contended that the City permitted tenancies in the flex building space of a home improvement contractor, a tutoring business, a kidney dialysis center, a medical clinic, a church, a vending business, and a sleep clinic. MIE alleges that these tenancies are contrary to the City’s interpretation of the Covenants.
Maryland appellate courts have long recognized the equitable defense of waiver in restrictive covenant cases. Jaggers,
On the first ground asserted by MIE, there was simply not enough evidence adduced by MIE to compel acceptance of its claim that the presence of the “Melford House” and a sculpting studio on the Property was inconsistent with the Covenants. The party seeking to prove waiver bears the burden of proof of establishing that defense.
Canaras v. Lift Truck Servs., Inc.,
MIE next points to the fact that the City extinguished the Covenants’ applicability with regard to certain parcels of the Property acquired by the federal government for the construction of the Institute for Defense Analysis and Census Bureau buildings.
31
This was achieved by the City executing and recording in the land records of Prince George’s County a “Declaration of Covenant Extinguishment and Reinstatement,” which provided that the parcel acquired by the federal government was released from the encumbrance of the Covenants until such time as any non-federal entity held an interest therein.
32
This limited extinguishment was accomplished
*701
by the means prescribed in the Agreement and the Covenants: “in writing and [ ] signed by the party against whom the enforcement of such waiver, modification or amendment is sought, and then only to the extent set forth in such instrument.” The waiver, signed by all concerned parties, was personal to the federal government and thus, may not be extended by MIE to embrace its activities on the Property. Furthermore, because MIE asserts waiver by acquiescence, the City’s grant of a waiver to another is irrelevant.
Kirkley,
MIE’s third ground for establishing waiver is unavailing for a reason similar to that underlying our rejection of the second ground: a purported oral waiver of the Covenants is ineffective when the Covenants specify that their waiver must be accomplished in writing. MIE asserts, based on deposition testimony of Edward St. John, President of MIE, that he was told by MIE’s Development Director, Ramon Benitez, who in turn was told by City of Bowie officials, that the Covenants were waived for the federal government and should not prevent MIE from developing the Property. 33 This was an oral communication and, under the circumstances, could not be an effective waiver. Moreover, the Circuit Court found no waiver on this ground based on its evaluation of the competent evidence. We find no clear error in the Circuit Court’s judgment.
On MIE’s final waiver ground, we note that the record does not demonstrate that the City had the requisite knowledge of the allegedly violative uses of the Property in the flex budding space occurring after MIE purchased the Property. There was no determination by the Circuit Court that the uses *702 violated the Covenants. Upon our examination of the record, we observe nothing demonstrating clearly that this is the case. Even if the uses violated the Covenants, MIE did not prove satisfactorily that the City was aware of them such that it could acquiesce in their existence. In fact, evidence was adduced by the City that not all tenancies on the Property are or were brought to the City’s attention, including many, if not all, of those to which MIE refers in its fourth and final ground for establishing waiver.
MIE suggests that we should uphold the Court of Special Appeals’s limited remand to allow the Circuit Court to consider additional evidence on the waiver argument. This is unwarranted. The intermediate appellate court permitted reconsideration of the waiver defense solely because it was remanding the case on the question of the Covenants’ validity. Because we find no error in the Circuit Court’s analysis of the latter point, no remand is necessary or warranted, obviating the exercise of discretion by the intermediate appellate court in allowing consideration of further waiver evidence.
D. The Non-Joinder of The Dance Studio
MIE’s final argument is that the City failed to join to its suit the Dance Studio, which it believes to be a necessary party. Maryland Code (1974, 2006 RepLVol.), Courts & Judicial Proceedings Article, § 3-405(a)(l) requires that when “declaratory relief is sought, a person who has or claims any interest which would be affected by the declaration, shall be made a party.” Further, Maryland Rule 2-211 provides, in relevant part:
(a) Persons to be joined. Except as otherwise provided by law, a person who is subject to service of process shall be joined as a party in the action if in the person’s absence
(1) complete relief cannot be accorded among those already parties, or
(2) disposition of the action may impair or impede the person’s ability to protect a claimed interest relating to the subject of the action or may leave persons already parties subject to a substantial risk of incurring multiple *703 or inconsistent obligations by reason of the person’s claimed interest.
These rules are intended “ ‘to assure that a person’s rights are not adjudicated unless that person has had his “day in court” ’ and to prevent ‘multiplicity of litigation by assuring a determination of the entire controversy in a single proceeding.’ ”
Bodnar v. Brinsfield,
MIE contends that the declaratory judgment affects the Dance Studio’s interest in its leasehold interest and use of a portion of the Property because the judgment stated that the “Dance Studio is not a permitted use under the Covenants, the Annexation Agreement, and the Amendments thereto.... ” Thus, MIE argues, because the Dance Studio was not joined as a party defendant to the law suit by the City, the objectives of the joinder requirement were frustrated. The Court of Special Appeals found implicitly that the Dance Studio had a cognizable interest in the suit, a conclusion which we accept arguendo, but opined that the non-joinder was not fatal.
In excusing the non-joinder, the Court of Special Appeals applied an exception to the joinder requirement: “persons who are directly interested in a suit, and have knowledge of its pendency, and refuse or neglect to appear and avail themselves of their rights, are concluded by the proceedings as effectually as if they were named in the record.”
Bodnar,
We agree with the Court of Special Appeals’s conclusion that the Dance Studio falls within the non-joinder exception discussed in
Bodnar.
In doing so, we identify as the controlling principles the non-joined party’s
knowledge
of the litigation affecting its interest and its ability to join that litigation, but failure to do so. In several cases applying the exception recognized in
Bodnar,
the Court relied on the fact that the non-joined party participated as a witness in the litigation affecting its interest, emphasizing the non-joined party’s
knowledge
of the relevant litigation.
See, e.g., Reddick v. State,
In the present case, Cheryl Brennan, the owner of the Dance Studio, by virtue of having submitted an affidavit and testifying at trial in the present case, undeniably was aware of the lawsuit affecting her interests. With that knowledge, she had the opportunity to seek counsel and join the lawsuit. She did not do so. Thus, the well-recognized exception to nonjoinder binds the Dance Studio to the Circuit Court’s judg *705 ment. Having reviewed the points of error raised by MIE, we conclude that the Circuit Court did not abuse its discretion in rendering a declaration of the continuing vitality of the Covenants and granting conforming injunctive relief in favor of the City.
JUDGMENT OF THE COURT OF SPECIAL APPEALS REVERSED; CASE REMANDED TO THAT COURT WITH DIRECTION TO AFFIRM THE JUDGMENT OF THE CIRCUIT COURT FOR PRINCE GEORGE’S COUNTY; COSTS IN THIS COURT AND IN THE COURT OF SPECIAL APPEALS TO BE PAID BY MIE.
Notes
. The City was authorized to annex the Property. See Md.Code (1957, 1981 Repl.Vol., 1984 Cum.Supp.), Article 23A, § 19.
. In accordance with the requirements of Article 23A, § 19, the Agreement was ratified by resolution of the Bowie City Council on 30 September 1985, which became effective on
14
November 1985. For a discussion of the annexation process generally,
see Mayor & Town Council of Oakland v. Mayor & Town Council of Mountain Lake Park,
. The Covenants also were attached as an exhibit and made a part of the Agreement. The Agreement provided in Recital D.3(b) an enumeration of permitted uses of the Property mirroring the restrictions set forth in the Covenants. By the terms of the Agreement, these enumerated uses were to control "notwithstanding that under the existing zoning for the Property (E-I-A Zone), certain manufacturing uses are permitted....”
. The City exercises no planning and zoning powers. With the exception of the City of Laurel, no municipality in Prince George’s County possesses planning and zoning powers. See infra note 23. The County zones and otherwise regulates land use through the governmental powers of zoning and planning. Hence, the City apparently sought to fashion a role for itself in the land use arena through the vehicle of the Covenants. Of course, achieving this goal required the willing cooperation of the owners of the Property.
. In June 1988, two entities, Marlborough C.L., Inc. and D3J Limited Partnership, assumed ownership of large portions of the Property from Carley Capital Group and the University of Maryland Foundation, Inc. Marlborough C.L., Inc. and D3J'Limited Partnership assumed ownership of these parcels subject to the Agreement and the Covenants. During the time these entities owned the Property, they sold off small portions to others not identified in this record.
. When Marlborough C.L., Inc. and D3J Limited Partnership assumed their ownership interests, the Agreement was amended to remove a term relating to Carley Capital Group’s guarantee of special district taxes and add a term further restricting the permitted uses to which the Property might be put.
. Mr. Blumberg was offered and received as an expert in land planning.
. Mr. Kieffer was offered and received as an expert in land planning.
. Dr. Basu was offered and received as an expert in real estate economics.
. MIE presented the following questions to the intermediate appellate court:
1. Whether the trial court erred in entering a declaratory judgement and permanent injunction that impair[s] the rights of a non-party, C & C Dance Studio[?]
2. Whether the trial court erred in ruling that the C & C Dance Studio violated the Prince George’s County zoning ordinance!?]
3. Whether the trial court erred in finding that the covenants were enforceable!?]
4. Whether the trial court erred in finding that the City was not estopped from enforcing, or had not waived enforcement of, the covenants!?]
5. Whether the covenants should be deemed void as a violation of state law[?]
. Evidently, the purpose of the Covenants, as viewed by the Court of Special Appeals, was "that the Maryland Science and Technology Center [would] be developed on the property.” The court, however, did not state expressly whether it meant that the purpose was strictly to develop the land in conjunction with the University of Maryland, as MIE posits, or whether the purpose was broader in nature and directed more generally towards the development of a generic science and technology park, with or without the University’s involvement, as the City asserts. Because the intermediate appellate court quoted extensively, and did not find clear error in, the Circuit Court’s findings of fact, which determined that the purposes of both the Agreement and the Covenants were to have the Property developed as “a science and technology center with ancillary uses.... [in which] [t]he University’s participation was preferable ... but was not a 'deal breaker,’ ” we conclude that the intermediate appellate court adopted the finding of the trial court as to the purpose of the Covenants.
. Although MIE obliquely calls into question the content and form of the Covenants, it has not mounted a full-fledged attack on the valid creation of the Covenants. MIE declares:
The Covenants do not contain any of the provisions ordinarily found in' a declaration of covenants. For example, the Covenants contain no specified duration, no provisions for termination or renewal, and no mechanisms for enforcement or amendment. Indeed, other than recitals referring to the conditional annexation, the Covenants consist of nothing but a portion of the then-existing Prince George’s County zoning code limiting development within [the Property] to the [uses it enumerated].
Regardless of whether the Covenants are atypical for their species, MIE is incorrect on several allegations regarding alleged deficiencies in the Covenants. The Covenants state that they "shall run with the land permanently” or until terminated or modified by the parties "by recording a termination or modification statement duly executed by all the parties.” (emphasis added). Also, although the Covenants incorporated or referred to many of the zoning uses provided in the E-I-A zoning in which the Property was classified initially by the County, there are at least six original or modified E-I-A permitted zoning uses specifically tailored to the purpose envisioned for the development concept for the Property.
. As discussed previously, restrictive covenants, where there is a covenantor and covenantee, are a species of contract. Thus, they are interpreted in a like manner as other types of contracts.
SDC 214, LLC v. London Towne Property Owners Ass’n,
. The University of Maryland Foundation, Inc., one of the' original Developers, although affiliated with the University of Maryland System, is a separate, non-profit corporation.
. MIE argues, nevertheless, that the City waived enforcement of the Covenants. We address this argument, infra Part IV.C.
. When ambiguity is found in a contract, it becomes a question of fact to decipher the intent of the parties in forming the instrument.
McLean, Koehler, Sparks & Hammond
v.
Schnepfe,
. We note that the fact that the land subject to restrictions would be more valuable without the restrictions is not controlling on a determination of whether a covenant should be deemed valid in this analysis.
Texas Co. v. Harker,
. Real covenants, such as the Covenants in this case, are an interest in land.
See Mercantile-Safe Deposit & Trust Co. v. Mayor & City Council of Baltimore,
. MIE, through counsel, exaggerated the age of the Covenants in its Motion to Amend Scheduling Order, filed on 5 September 2003, by stating that it was "approximately twenty five (25) year[s] old....” In actuality, the Covenants were not quite 18 years old at the time of MIE’s assertion. At the time this opinion is filed, the Covenants will not have reached their 22nd birthday.
. Further, based on our review of the fact-finding by the trial judge, there has been no change in circumstances to the extent noted in our cases where covenants were deemed unenforceable after 20 to 50 years of existence.
. The City of Rockville implemented its delegated zoning authority in Rockville City Code, § 25-2. See Maryland Code (1957, 2003 Repl. Vol.), Article 66B, § 4.01, for the source of that authority.
. Maryland Code (1957, 2003 Repl.Vol.), Art. 28, § 8-101.
. Prince George’s County Code, § 27-500.
. MIE stated in its brief that the City of Bowie possesses "limited zoning authority.” This is incorrect. The only municipality in Prince George’s County invested with zoning authority is the City of Laurel.
Prince George's County v. Mayor & City Council of Laurel,
. The City contends mistakenly that MIE did not preserve its “waiver'' argument because it failed to assert it in the Court of Special Appeals. In fact, MIE raised the principles of waiver and estoppel in its Answer at the trial court level and argued in its brief before the Court of Special Appeals that the City had waived its right to enforce the Covenants.
. The covenantor defendant is the party whose conduct the covenantee actually seeks to enjoin. It is often the case that there is more than one covenantor to a covenant and, indeed, that multiple covenantors are violating the covenant, but only one is sought to be enjoined.
. Waiver by abandonment is similar to the change in circumstances standard we discussed supra, but with two distinguishing factors: where the inconsistent use is taking place and by whom. Waiver by abandonment concerns violative uses of the land subject to a restrictive covenant carried out by covenantors other than the one sought to be enjoined. The change in circumstances standard often involves changes to the surrounding neighborhood of the subject land that are inconsistent with the covenant’s restrictions, but are neither carried out on the subject land itself, nor by any covenantor.
. In order for someone to acquiesce to something, they must have knowledge of it.
Whiting v. State,
. Whether the kind of waiver attributed to this case is of the acquiescence or abandonment variety is merely a technical matter. The substantive result is the same in either instance on the record here.
. Apparently, the sculptor was distressed about some vandalism that had occurred in the space he used as a studio and to his sculpting implements. It was only then that the Cily became aware of his use of the space.
. The Circuit Court concluded that "[t]he Federal Government's presence at the site was in keeping with the Covenants. [The Federal Government's] insistence on a ‘Declaration of Extinguishment’ during their possession of a parcel at the Center does not constitute a waiver of the Covenants.” To the contrary, the extinguishment was a waiver of limited effect and duration. The case of
Speer v. Turner,
. The extinguishment also covered a parcel acquired by the State of Maryland, a fact not discussed by MIE nor, as a result, this opinion.
. The City argues that this testimony consisted only of "self-serving and hearsay declarations.” We express no opinion as to the merits of the City’s unpreserved at trial, and thus waived, hearsay objection to St. John’s deposition testimony. Maryland Rules 2-415(g), 2-517(a);
Mayor & City Council of Baltimore v. Theiss,
