Appellant Elliot Malone challenges a decision of the trial court granting appellees Robinsons’ suit to quiet title in a residence, inherited by Malone from his deceased parents, and purchased by the Robinsons at a tax sale. Appellant bases his challenge in significant part on the District’s failure to take any further action to furnish notice of the expiration of the two-year redemption period after the District’s official notice of the expiring redemption period, sent by certified mail, was returned by the postal service as “unclaimed.” Against the backdrop of the constitutional issues presented by a contrary construction of the regulation, we construe the D.C. regulation providing that a record owner “be notified, by certified or registered mail, of the final date by which he must redeem his property,” 9 DCMR § 317.3 (1982), to require the District to take some reasonable additional action to contact the record owner if the notice is returned unclaimed.
*35 I
The owners of record, John and Fonnie Malone, died in 1976, leaving their son, Elliot, as sole heir and executor. Elliot paid off the mortgage in 1978. He testified that he resided in the home for four years after the death of his parents but subsequently found lodging with friends in Montgomery County in order to be near his place of employment. He continued to receive mail at the District home, checking at least once a week. He did not think it was necessary to have the property formally recorded in his name.
Mr. Malone testified that in December 1982 he received a notice of a registered 1 letter addressed to his parents. He went to the post office with identification and a letter of administration but the post office would not release the letter to him. In January 1984, he received a tax bill and he went to the District’s Department of Finance and Revenue (hereafter “Department” or “DFR”) to pay the amount of $1,471.20. In 1985, he paid taxes in the amount of $1,639.74. In 1986, he paid taxes in the amount of $1,491.00. He testified that he was told by a tax clerk that the amounts were applied to the earliest existing due taxes.
Meanwhile, on January 23, 1981, some two years before Mr. Malone received the notice of a certified letter addressed to his parents; the residence was sold to Mr. Robinson at a tax sale for unpaid 1980 taxes. 2 The tax deed was executed on June 17, 1986. 3
Mr. Malone testified that the first knowledge that he had that the property was no longer his came in July of 1986 when Mr. Robinson pinned a copy of the tax deed on his door. Mr. Malone denied having received a notice of expiring redemption. Documentary evidence was introduced at trial showing that a letter dated December 1, 1982, headed “Notice of Expiring Redemption Period for the January 1981 Real Estate Sale” and sent by certified mail to the Malones, was returned to the Department marked “unclaimed.” The record does not indicate whether the Department made any further effort to contact the Ma-lones.
The files before us show three further notices of the expiring redemption period, dated September 13, 1984, February 12, 1985, and June 12, 1985, sent to a mortgagee of the property, explaining that the residence had been sold, that the two-year redemption period had expired in January 1983, but that “in light of a recent court decision” the mortgagee might redeem the property by paying the amount necessary to redeem within thirty days. A returned letter from the financial institution, dated June 26, 1985, advised the government that the mortgage was paid off in 1978.
II
A
Appellant contends that he was deprived of his property without due process of law because he did not receive notice as required by statute.
4
The funda
*36
mental, constitutional right to the preservation of one’s property, as well as one’s life and liberty, requires strict adherence to due process requirements. The power to convey property for nonpayment of taxes can be validly exercised only by strict compliance with the relevant statutes and regulations.
Frassetto v. Barry,
Prior to a tax sale, the District must send the record owner notice of delinquency and must advertise in two newspapers of general circulation that the property will be sold. D.C.Code §§ 47-1301, -1302 (1990). The statute also provides that the owner of real property sold for nonpayment of delinquent taxes has the right to redeem the property at any time within two years of the sale. D.C.Code §§ 47-1304, -1306(a) (1990). In furtherance of this statutory right of redemption, the Council of the District of Columbia in 1975 adopted Regulation 74-35, which required the District to notify property owners of record of the impending expiration of the redemption period. 5 Regulation 74-35 provides:
Not less than thirty (30) days prior to the expiration date of the two year redemption period, the record owner shall be notified, by certified or registered mail, of the final date by which he must redeem his property.
9 DCMR § 317.3 (1982).
6
This court previously has stated that actual notice of the expiration of the redemption period is not mandated either as a matter of due process or of construction of the regulation, and that notice by mail to the record owner generally satisfies due process commands.
Boddie, supra,
At the same time, we have never before addressed, and indeed have expressly reserved for future resolution,
Boddie, supra,
B
When a notice of expiring redemption period informing the record owner that
*37
he could shortly lose his interest in his property is returned as unclaimed, the District knows that, as to that particular notice, the record owner may be no better off than if the notice had never been sent. “An elementary and fundamental requirement of due process in any proceeding which is to be accorded finality is notice reasonably calculated, under all the circumstances, to apprise interested parties of the pendency of the action and afford them an opportunity to present their objections.”
Mullane v. Central Hanover Bank & Trust Co.,
This court recently has had occasion to apply these principles in the context of a tax sale whose validity was challenged on the ground that a trustee under a deed of trust did not receive constitutionally adequate notice of proceedings connected with a tax sale.
Mayhew, supra,
Leaving open the question when due process required the District to provide the trustee with “notice by mail or its equivalent,” the Mayhew court concluded that the District never gave adequate notice to the trustee. Id. at 43-44. Although the trustee’s address was not part of the public record, his name appeared on the recorded deed and his business and home addresses were listed in the Montgomery County, Maryland and District of Columbia telephone directories. On these facts, this court found that the trustee’s address was “reasonably ascertainable,” and that even the telephone call to the trustee:
was not adequate inquiry excusing the failure to notify [the trustee] by mail or personal service at the listed addresses. *38 Without further inquiry by telephone or otherwise, the District could not simply assume that [the trustee] it spoke with was not the individual named on the deed of trust. A single phone call which, as the [trial] judge noted, did not even call [the trustee’s] attention to the fact he was listed as a trustee on the deed did not relieve the government of its duty of notice under Mennonite.
Id. at 44-45.
C
Permitting the District to issue a valid tax deed where it knew that the property owner had not received the required official written notice of the expiring redemption period would, at the very least, raise questions as to the constitutionality of the District’s actions, given that “constructive notice by publication is [insufficient to inform interested parties, at least ‘those who could be notified by more effective means such as personal service or mailed notice.’ ”
Id.
at 43 (quoting
Mennonite, supra,
By mandating that “the record owner [] be notified, by certified or regular mail, of the final date for redeeming the property,” the Council indicated the particular importance it attached to this potentially final opportunity for people to save their property.
10
The return of the certified notice marked “unclaimed” should have been a red flag for some further action.
See, e.g., Giacobbi v. Hall,
D
As we noted in
Mayhew, supra,
“the issue boils down to whether the District made reasonable efforts to locate the [record owners] to give them the required notice.”
Our interpretation of the regulation is not inconsistent with prior decisions of this court in which we upheld the validity of tax sales where heirs or devisees of the record owner had not received notice of the tax delinquency or the expiration of the redemption period and notices had been returned unclaimed.
Moore v. District of Columbia,
The trial court, concluding that Moore was controlling, did not have occasion to explore the application of the regulation as interpreted in this opinion. Following our practice in Keatts I, supra, and Kerwin, supra, we accordingly reverse the judgment of the trial court and remand for further proceedings consistent with this opinion.
So ordered.
Notes
. The return receipt shows that the letter actually was sent by certified mail.
. At trial, the District did not produce evidence that it had mailed to the property address the delinquent tax bills advising of the impending tax sale.
. Appellant questions whether the District strictly complied with the statutory requirements when it issued the tax deed more than five years after the tax sale. The statute states only that the tax sale purchaser must apply for the tax deed within five years. D.C.Code § 47-1304 (1990). Here, the tax deed stated that the appel-lee complied with this requirement, and appellant has not pointed to any evidence to the contrary.
.Appellant also seems to invoke an estoppel argument based on the District’s acceptance of tax payments from him after the redemption period had expired. Estoppel against the District, however, cannot affect appellee’s rights as the purchaser at the tax sale, which accrue upon expiration of the redemption period. D.C.Code § 47-1304.
See Industrial Bank of Washington v. Sheve,
Appellant’s actions, however, may color his situation in a broad, equitable sense. We take no position on any rights appellant may have to a refund of those taxes from the District.
. The Council adopted the regulation pursuant to then D.C.Code § 47-641(c) (1978 Supp.) (re-codified at D.C.Code § 47-820(c) (1990)), which provides:
The Council may adopt regulations concerning the assessment and reassessment of real property and matters relating thereto which shall be consistent with the provisions of this chapter and other applicable provisions of law.
The regulation made mandatory the prior administrative custom of notifying property owners of the impending expiration of the statutory redemption period.
See Boddie, supra,
. The notice of expiring redemption period in this case was mailed when the 1982 version of the District of Columbia Municipal Regulations was in effect. The regulations have since been updated, but § 317.3 has not been changed.
. The
Mennonite
Court assumed that although the mortgage on file identified only the mortgagee’s name and the county in which it was located, the mortgagee’s address "could have been ascertained by reasonably diligent efforts."
Id.
. It is a well-settled principle of statutory construction that, when possible, a statute should be construed to protect its constitutionality.
See, e.g., Dove v. Dairyland Ins. Co.,
In this regard, we have followed a similar approach in the related context of notice by service of process.
See Frank Emmet Real Estate, Inc. v. Monroe,
. Had the notice of expiring redemption period not been returned, the District’s mailing of that notice would have comported with the Council’s regulation and been constitutionally adequate, since service by mail is reasonably calculated to give notice in most circumstances.
Boddie, supra,
The requirement that the Department take reasonable efforts to notify the record owner when the notice of expiring redemption is returned unclaimed also presumes that the notice was not returned unclaimed due to a deliberate refusal to accept delivery. In that or an analogous situation, the property owner is hardly in any position to take advantage of any failure by the District to take further steps.
See Helland v. Larson,
.The fact that the Department had some weeks previously sent by ordinary mail an unre-turned letter explaining that the redemption period would soon expire and that an official notice of the expiring redemption period would follow cannot serve as a substitute for the required official redemption notice.
. In
Kerwin,
the property owners did not file a change of address form with the Department, but they testified that they twice orally informed the Department of their new address, and the Department mailed income tax forms to the owners’ new address.
Kerwin, supra,
. Indeed, in Kerwin the notice of expiring redemption period was returned to the Department marked "moved: not forwardable.” Department records showed that an employee unsuccessfully attempted to find a telephone listing for the property owners, though the owners were listed in the District telephone directory at the time. The parties did not address in the appeal the constitutional adequacy of the District’s efforts after the notice of expiring redemption period was returned, and this court similarly focused more generally on the Department’s duty to check its records for the owner’s correct address. Id. at 1306-07.
