delivered the opinion of the Court.
This is an appeal by Frederick P. McBriety and other property owners and taxpayers (the owners) from a decree of Circuit Court No. 2 of Baltimore City declaring that Ordinance No. 1077 1 (the ordinance) of the Mayor and City Council of Baltimore (the City), dated November 7, 1957— which provides for the registration and licensing of certain rooming houses and multiple family dwellings—was valid, and dismissing the supplemental bill of complaint with costs.
On July 2, 1957, the owners filed an original bill challenging the validity of a similar ordinance (No. 994), dated June 10, 1957. After a hearing on the demurrer, the court (Cullen, J.) overruled it and issued an interlocutory injunction forbidding enforcement of Ordinance No. 994 pending the litigation relative to that ordinance. The City reacted by causing the repeal and reenactment of the ordinance which is the subject of this appeal. When reenactment had been accomplished, the owners, with leave of the court, filed a supplemental bill on November 14, 1957, on behalf of themselves and all other taxpayers. A motion to extend the injunctive *228 relief to the reenacted ordinance was denied by the court (Cullen, J.).
The individual plaintiffs-appellants, eleven in number, are,, owners, who rent or lease their properties to tenants of more than two dwelling units or two dwelling units and another occupancy. The corporate plaintiff-appellant is a taxpayers’ protective association representing a membership of one hundred and seven property owners. The defendants-appellees are the City, the Board of Estimates, several city officials, the Police Commissioner, the Urban Renewal and Housing Commission and the Attorney General of Maryland. All of the defendants, other than the Attorney General, the City and the Police Commissioner, are city officials or agencies.
The comprehensive, and somewhat novel, ordinance is, as its title and recitals indicate, aimed at the licensing and periodic inspection of certain rooming houses and multiple family dwellings and combinations thereof in order to eliminate the causes and unnecessary -burdens and hazards of overcrowding and, in the public interest, to assure compliance with existing laws and ordinances for the better protection of the public health, safety, morals and general welfare. There was also a recital of the inadequacy of the “present” rooming house license fees to provide for the required inspectional service.
In substance, the ordinance prоvides that “[no] person shall conduct or operate * * * any rooming house, multiple family dwelling, or any combination thereof, without * * * obtain [ing] a license * * and defines certain terms used in the ordinance such as the meaning of “person,” “operator,” “rooming house,” “multiple family dwelling,” “or any combination thereof,” “dwelling unit” and “rooming unit.” A “multiple family dwelling” is defined as a house, building or combination of buildings used or intended to be used “for more than two dwelling units or two dwelling units and any other occupancy,” and includes apartment houses, garden apartments and apartment hotels. Other provisions sеt forth certain administrative and operational procedures and requirements of the ordinance. The annual license fees were fixed at $3 per rooming unit, $5 per dwelling unit and $3 and $5, *229 respectively, for combinations of rooming and dwelling units, with máximums of $200 in each case.
The supplemental bill alleges in effect that the ordinance is unconstitutional and illegal because:
[i]. It violates Article 23 of the Declaration of Rights in the Constitution of Maryland and the Fourteenth Amendment of the Constitution of the United States by denying “due process of law” and the “equal protection of the laws” in that—
(а) The intended licensing of the “operation” of a multiple family dwelling as defined in the ordinance is neither reasonable nor required for the protection of the health, safety, morals and general welfare of the public and is an unreasonable and arbitrary exercise of the police power;
(b) The ordinance is unnecessary for the protection of the public interests since it adds nothing to the existing and adequate building, police, health and fire regulations;
(c) The intended classification of multiple dwellings— because it excludes one and two unit dwellings—is an abusе of the police power and bears no reasonable relation to the public interests;
(d) The license fees bear no reasonable relation to the expenses of the intended licensing and inspection services;
(e) There are unlawful delegations of legislative power to the building inspection engineer, the commissioner of health and the chief of the fire department;
(f) There is an unlawful delegation of power to the police commissioner, who is an official of the State;
(g) The provisions of the ordinance are vague, indefinite, and ambiguous;
(h) The provisions of the ordinance for the revocation or denial of licenses are invalid;
(i) The ordinance is discriminatory;
(j) There is no provision for reinstatement or reissuance of a license after revocation; and 2
*230 (k) Section 15(b) of the ordinance invalidly seeks to impose criminal liability by a conclusive presumption.
[ii] . It violates Section 28 of the City Charter in that the title is defective and deceptive.
[iii] . It may be construed as a revenue measure, and if it is, it violates Article 15 of the Declaration of Rights.
All of the defendants answered and denied the illegality and unconstitutionality of the ordinance.
There was testimony that there was no overcrowding and ' that the ordinance was discriminatory and unnecessary because it excludes one-and-two unit dwellings and imposes an additional special tax on multiple family dwellings; because properties which are less safe and have more occupants are not licenseable under the ordinance; because the existing regulations were adequate and were being enforced; because there were more deaths and injuries from fires and other hazards over a six year period in one-and-two family dwellings than in three-or-more family dwellings; and because the ordinance had destroyed the value of multiple family dwellings as income producing investments.
But there was also testimony that there was no discrimination between the one-and-two unit dwellings and the multiple family dwellings as defined in the ordinance; that there were more violations of the health and fire codes in the buildings having more than two dwelling units than in those with less dwelling units; that the ordinance was necessary from the standpoint of health because it was possible to do a better preventative job with it than without it; that there were unlawful increаses in the number of separate family units of which the city officials had no knowledge; that the number of dwelling units in a three-story house was of more importance from a fire safety standpoint than the number of occupants of the building because more gas and electrical units would be in use; and that the ordinance was part and parcel of the “Baltimore Plan” to control slum conditions and blight areas.
Under § 6 of the Charter of Baltimore City (1949) the Mayor and City Council were given power:
*231 “[T]o provide for the preservation of the health of all persons” [paragraph 11] ; “to license, tax and regulate all businesses, trades, vocations or professions” [paragraph 16]; “to have and exercise * * * all the power commonly known as the [p]olice [p]ower to the same extent as the State has or could exercise said power” [paragraph 24]; and “to pass any ordinance, not inconsistent with the provisions of this Charter or the laws of the State, which it may deem proper in the exercise of any of the powers, either express or implied, enumerated in this Charter, as well as any ordinance as it may deem proper in maintaining thе peace, good government, health and welfare of Baltimore City” [paragraph 39],
There is no room for doubt that under this broad and comprehensive grant of charter powers the City has full power and authority not only to
license
for regulatory purposes but also to
tax
for revenue purposes the rooming houses, multiple family dwellings and combinations thereof, defined in the ordinance, which is the bone of contention in this case, unless for reasons, which we shall presently consider, the ordinance is unconstitutional or illegal. See
Jacobs v. Baltimore,
There is also a presumption that a municipal ordinance is reasonable and for the public good, and the burden of proving the contrary is on those who attack it.
Lewis v. M. & C. C. of Cumberland,
This brings us to the consideration of whether the ordinance in question is unconstitutional or illegal for any of the reasons urged by the owners.
[i]
(a).
Reasonableness.
The ordinance has a reasonable relation to and is required for the protection of the public interests, and its enactment was not an unreasonable exercise of police power. While it is recognized that the law-making body may not arbitrarily or unreasonably exercise its power to regulate a business, trade or occupation, or to impose a tax thereon in such manner as would deprive a person of a right, privilege, immunity or property to which he is entitled, as is stated in
Dasch v.
Jackson,
We think it is clear that- the operation of the business of renting or leasing housing accommodations has a direct re
*233
lationship to the public interests in the City of Baltimore and that the regulation thereof afforded by the ordinance is not only reasonable but is salutary. The argument advanced by the owners—which they claim was ignored by the chancellor —to the effect that the privacy of a lessee is not subject to regulation (a truth which the defendants-appellees do not even contest), overlooks the fact that it is the operators, who engage in the business of leasing multiple family dwellings, that are subjected to regulation by the terms of the ordinance, and not the tenants who lease from them. Moreover, it is not likely that a tenant would object to an occasional inspection of his place of abode for health, fire and other hazards. In any event, since no lessеe is a party plaintiff to this action, the argument advanced by the lessors—asserting on behalf of a hypothetical lessee a potential violation of a constitutional right—is premature. If, hereafter, a lessee should assert such right on his own behalf, the question, which will then be real and live, can be answered. Cf.
Simpson v. Board of
Appeals,
(b).
Necessity.
Whether the ordinance was actually necessary is a question with which the courts are not concerned. A court does not pass upon the wisdom of an ordinance nor approve or disapprove it. The function of the courts, if and when the question is raised, is to ascertain whether the ordinance exceeds constitutional limits.
Givner v. Commissioner of Health,
(c), (i).
Abuse of Power and Discrimination.
The classification of more-than-two dwelling units [or two dwelling units and another use] as “multiple family dwellings”—and the exclusion of one-and-two dwelling units—was not an abuse of police power nor was it discriminatory, and such classification bore a reasonable relation to the public interests. The owners, in addition to claiming that fire and other hazards were greater in single family dwellings than in multiple [two or more] family dwellings, contend that the ordinance does not apply equally to situations substantially identical or equally to situations affecting the public interests. A mass of evidence and exhibits as to this subject was offered by the
*235
owners, much of which is difficult to understand; some is claimed by the City to be misleading if not erroneous; and there was also evidence to the contrary offered by the City, but, be that as it may, the chancellor found that dangers were more prevalent in buildings containing more than two dwelling units than in those having only one-or-two dwelling units and we see no reason to disturb his ruling. He further found that, from health and fire safety standpoints, the number of dwelling units is of more concern than the height in stories or the number of persons who reside in one-and-two dwelling units. Finally, he found that the classification of multiple family dwellings in accordance with the ordinance was reasonable and was neither arbitrary nor discriminatory. We agree. This Court has consistently held that “the question of classification [for the purpose of license fees] is [primarily] for the legislature; and courts will not interfere unless the classification is clearly unreasonable or arbitrary.”
Bevard v. Baughman,
The decisions in other jurisdictions are to the same effect. The smoke-abatement ordinance before the Court in
Board of Health v. New York Cent. R. Co.,
4 N. J. 293,
*235 “The exigency and the remedy were peculiarly within the judgment of the local legislative body; *236 and unless there be an utter lack of basis for the classification, the action taken is not discriminatory in the constitutional sеnse. * * * The Legislature may make distinctions of degree having a rational basis; and they will be presumed to rest on that basis if there be any conceivable state of facts which would afford reasonable ground for its action.”
In addition to claiming that the ordinance is discriminatory as to its application among multiple family dwellings, the owners also contend that the ordinance is discriminatory as to the license fees because there is a maximum; because one bedroom dwelling units have the same license fee as a five bedroom dwelling unit; and because religious as well as other eleemosynary and charitable institutions are exempted from paying the license fee, but they cite no authorities for such contentions, and we know of none, holding that for any of these reasons, an ordinance would be discriminatory.
(d) and Question [iii].
Revenue Measure.
The license fees, when averaged over a prospective five-year period, bear a reasonable relation to the expense of licensing and to the inspection services renderable under the ordinance. The owners, contending that the charges collectible under the ordinance are liсense fees rather than taxes, claim that the amount of the fees to be collected must be limited to the expenses to be incurred in enforcing the ordinance, citing
City of Baltimore v. Canton Co.,
In addition to claiming that the estimated license fees do not bear a reasonable relation to the estimated expenses, the owners also contend that the ordinance violates Article 15 of the Declaration of Rights [requiring uniformity within the taxing district] and also § 5 of the Charter [requiring uniformity in the rate throughout the City], These contentions have already been answered, but we might add that, even if we assume, without deciding, that the license fee is a revenue measure, it is not a direct tax on property, but is a tax on the business of renting or leasing housing accommodations. As was said in
Maryland Racing Comm. v. Maryland Jockey Club,
“The difference between this tax and that on real and personal property is that the property must pay regardless of the ownership, while the business man can decide whether he will continue in business or *238 not, and thus decide whether there will be a tax or no tax * *
(e), (f).
Delegation of Power.
The power and authority-conferred upon the building inspection engineer, the commissioner of health and the chief of the fire department to adopt proper and necessary rules and regulations to enforce the ordinance for the protection of the public interests is not an unlawful delegation of legislative power.
Pressman v. Barnes,
With respect to the alleged delegation of power to the po *239 lice commissioner, who, anomalously, is an official of the State, not the City, it is clear that the ordinance does not require him to perform any duties whatsoever. See § 6, supra. That the police commissioner may—since he consistently does cooperate with the municipal authorities—certify his findings under subsections (a) and (b) of § 6, supra, does not make the ordinance illegal. In any event, even if we should determine that § 6, supra, in so far as it applies to the police commissioner, is invalid, the remainder of the ordinance would not thereby be affected. See § 2(b) of Chapter 15 A, supra.
(g), (h).
Invalidity for Vagueness or Other Cause.
The owners contend that the provisions of certain parts of the ordinance—§ 2(b) [the term “operator”], § 2(e) [the term “or any combination thereof”], § 3(a)(9) [investigation of the character and qualifications of applicant for rooming house licenses], § 5 [renewal of licenses], § 6(a) [revocation of license for failure to comply with notice to correct violations of law] and §
7
[notice, hearing and appeal]-—are
too
vague and indefinite (though not ambiguous as alleged in the bill) or otherwise invalid. They cite and rely on
Theatrical Corp. v. Brennan, supra, Schneider v. Duer, supra, Tighe v. Osborne
(
(j). Absencе of Provisions for Reinstatement or Reissuance after Revocation. Because there is no provision in the ordinance for the reinstatement or reissuance of a license after revocation, the owners contend the ordinance is unreasonable and oppressive and suggest that such omission may well be *240 such cruel and unusual punishment as is forbidden by Article 25 of the Declaration of Rights, but they do not contend that the ordinance is invalid for any of the reasons assigned, and it is not. See 9 McQuillin, op. cit. supra § 26.81. It may be that the ordinance should be so amended as to permit the reinstatement or reissuance of a license in certain instances, but that is a legislative not a judicial function.
(k).
Invalidity of
§
15(b), supra.
The owners contend that the provisions of this subsection of the ordinance is an attempt to impose criminal liability without proof of knowledge or the guilt of the person in actual charge, management or control of the licensed premises and therefore denies due process of law. The incorrectness of this contention was settled in the recent case of
Haskin v. State,
We think it is clear that the ordinance does not violate Articles 23 and 15 of the Declaration of Rights or the Fourteenth Amendment for any of the reasons relied on by the owners referred to in this part [i] of this opinion.
[n]
The title of the ordinance is not defective or deceptive and does not violate § 28 of the Charter, which, as does § 29 of Article III of the Constitution of Maryland, provides that “[ejvery [ojrdinance * * * shall embrace but оne subject, which shall be described in its title.” The owners contend— because it regulates the licensing of rooming houses as well as multiple family dwellings with separate license fees and provisions with regard to the operation of each—that the ordinance embraces more than one subject. We do not agree. The same rules which govern the validity of the title of acts of the General Assembly also govern the validity of the title of ordinances of the City Council. See
Roland Elec. Co. v.
*241
Baltimore,
The decree of the lower court will be affirmed.
Decree affirmed, the costs to be paid by the appellants.
Notes
. Ordained as Chapter 15A [Licenses for Rooming Houses and Multiple Family Dwellings] of Article 5 [Building Regulations] of the Baltimore City Code (1950 ed.).
. Unless otherwise specified herein references to sections refer to sections of the ordinance.
