delivered the opinion of the court:
The question presented for our consideration is the determination of the law on the admitted facts as above set forth.
It is argued by defendants in error that the relator had no right to the writ of mandamus; that to entitle him to the relief prayed he must show some special damage other than that suffered by the public in general, and they cite the case of McDonald v. English, 85 Ill. 232, and rely upon this case, to a great extent, to sustain their answer. That was an action on the case for maintaining a public nuisance, the facts being, that appellee built, fronting on the street, by the side of appellant’s build- . ing, a stone step of the height of two feet and four inches and extending into the sidewalk in front of the building three feet and seven inches. Appellant claimed that the obstruction interfered with the access to his building- and brought his action for damages. The appellee introduced an ordinance in evidence which was almost identical with the ordinance in question, but noques* tion was raised as to the validity of the ordinance. The introduction of it was objected to by appellant. This court did not approve of the ordinance, but said that any effect it could have had on the jury was in appellant’s • favor, since the only thing it tended to prove was that the obstruction was unauthorized, as it extended into the sidewalk beyond the limit prescribed by the ordinance, and at page 236 we said: “We regard the rule well settled that for any obstruction to streets, not,resulting in special injury to the individual, the public, only, can complain,” and held that, inasmuch as appellant sustained no special injury, he could not recover. Other cases cited by defendants in error are of similar character and have no application to the questions here involved. In this case the individual is not undertaking to recover damages, nor can it be said that it is an individual complaining, but it is the public complaining throug'h *277one of its citizens. In a proceeding for mandamus to compel public officers to perform a duty to the public it is not necessary that the entire public join in the complaint, but they may speak or interfere through one of their citizens, the people being the real party. Nor is it necessary, in this kind of proceeding, for a relator to show that he has any legal interest in the result of the suit, as it is prima facie the duty of the mayor and city council to keep the streets free from all obstructions, and the power is granted to be exercised for the public benefit, and its execution can be insisted on as a duty. (Hall v. People ex rel. 57 Ill. 307.) In this case the act to be performed by the defendants in error is a duty in which the people of the whole State are interested, and no doubt is entertained of the right of any citizen of the city to become a relator and institute this proceeding. It is therefore evident that the relator, as a citizen of Champaign, was a proper person to institute this proceeding. (2 Smith on Mun. Corp. 1601-1604; High on Ex. Legal Rem. 431; County of Pike v. People ex rel. 11 Ill. 202; City of Ottawa v. People, 48 id. 233.) In the case of County of Pike v. People ex rel. supra, the same question was raised in a mandamus proceeding, touching the authority of any person who is a citizen to institute the proceeding, and we there said (p. 208): “Where the object is the enforcement of a public right the people are regarded as the real party, and the relator need not show that he has any legal interest in the result. It is enough that he is interested, as a citizen, in having the laws executed and the right in question enforced. * * * The object of the suit is not a matter of individual interest, but of public concern. Any citizen of the county, especially of the locality interested in having the improvement prosecuted, could become the relator and obtain the mandamus.”
The main question arising in this case, and the only one that we think need receive any special attention, relates to the power of the city to grant, by ordinance *278or otherwise, the privileges to the property owner provided for by section 261 of its ordinance, as set out in the answers of defendants in error, and under which they attempt to justify. In their answers defendants in error admit that the sections set out in the petition are a part of the body of the ordinances of said-city and are in force, but say that they must be considered together with section 261, which they set out. It will first be noticed that this section 261 does not purport to give authority to any one to do anything, but only inhibits certain things therein specified being done under a penalty. It does not, in effect, say to the citizens that they are authorized by city authority to build steps, platforms and other fixtures three feet into the street or extend windows eighteen inches into the street, but that if any step, platform or other fixture be extended into the street more than three feet or any window be extended into the street more than eighteen inches, the person who shall place or extend the same shall be subject to a penalty, and, as we think, is very different from a general ordinance of the city which contained a provision that all the property owners might build su,ch structures into the street to the extent of the distance named in the ordinance. But whether that view of it be tenable or controlling, we will treat the ordinance, for the purpose of our consideration, as defendants in error have done, as one supposedly giving authority to extend a window into the street eighteen inches.
Since 1845 our statute has declared it to be a public nuisance “to obstruct or encroach upon public highways, private ways, streets, alleys, commons, landing places, and ways to burying places.” (Starr & Cur. Stat. 1896, chap. 38, sec. 221, par. 5.) And while the legislature has vested in cities the power to lay out, establish, open, alter and vacate streets, and to regulate the use of the same, it also imposed upon them the duty to prevent and remove encroachments or obstructions upon the same. (Starr & Cur. Stat. 1896, chap. 24, par. 63, p. 694.) Defend*279ants in error admit that defendant in error Harris constructed and extended into the street a bay window to the extent of eighteen inches and that said window is about fifteen feet in width. Thus the questions are presented, does the projection into the street constitute a purpresture within the meaning of the law, and is it a nuisance, and if it is, can the city, by ordinance, authorize the maintenance of such nuisance by the citizens for private uses or purposes.
When a public highway is once established all the beneficial uses of it vest in and devolve upon the public, and where, as in incorporated cities, the title to the streets is vested in the municipality, they are nevertheless charged with the public right. In fact, the city could have no authority to accept public streets upon any other conditions than that they should be for public use, and what is meant by public use is that the public shall have the uninterrupted, unimpeded and unobstructed use of every portion and part of such public highway,—not only that they may use the ground or foundation to travel upon, (which right is co-extensive with every inch or foot of it,) but that they may enjoy the air, light and rainfall as well upon every portion of it. In Field v. Barling, 149 Ill. 556, on page 565 we said: “Before Holden Place was dedicated to the public as a street, the title of thq United States, the original proprietor, was not confined to the surface of the ground, but its title, extended upward, embracing the light and air as well as the soil, and the dedication of the strip of land for a public street embraced not only the surface of the ground, but the light and air above, and an individual has no more right to obstruct the light and air above the street than he has to obstruct the surface of the soil. In Barnett v. Johnson, 15 N. J. Eq. 481, where it was proposed to obstruct light and air over ground dedicated to the public, it is said: When the strip of land is declared a public highway, the adjoining owner has the right to light and *280air from it. The column of light and air above the roadbed, whether of land or water, is as much a part of the highway as the road-bed itself. Take them away and there would be left no public passage. By its being declared a highway by the sovereign power, the light and air above it become again the common property of all, which all may breathe and use whenever they may legally touch it, whether in the road or along its sides. * * * When cities and villages have been built up along a public highway, the right to light and air from it becomes vested, and even the legislature would have no more right to deprive them [abutting owners] of it without compensation than they would have to draw off the water from a navigable stream.’” Again, in Pennsylvania Co. v. City of Chicago, 181 Ill. 289, we said (p. 296): “The title of the streets is vested in the city, and it has the conservation, control, management and supervision of such trust property, and it is its duty to defend and protect the title to such trust estate. The city has no power or authority to grant the exclusive use of its streets to any private person or for any private purposes, but must hold and control the possession exclusively for public use, for purposes of travel and the like. * * * The rule is, that all public highways, from side to side and from end to end, are held for the use of the public, and no other safe rule can be adopted.” Then, with the admission of defendants in error in the record that they have built a strúcture fifteen feet across and eighteen inches out into the street, their averment that the relator is not injured thereby or the public travel is not obstructed or public use interfered with is but their conclusion of law, and was entitled to no consideration in considering the merits of their answer. (Hibbard & Co. v. City of Chicago, 178 Ill. 91.) In the latter case we said (p. 99): “The right of the public to the exclusive use of the streets for public purposes is inconsistent with the right of a private citizen to encroach thereon by the erection of a permanent *281structure. The streets are held in trust by the municipality, and this fact prevents the municipality from authorizing'any encroachment on or obstruction of them by such structures. The mere consent of the city council, by resolution or order, gives no vested right. * * * The averment that the awning so erected does not injure or obstruct any person does not change the cage. The sole question to be determined is, is it an encroachment on the street of the city, and if so, it is a purpresture.”
Mr. Elliott, in his work on Roads and Streets, uses the following language (p. 478): “Any permanent structure or purpresture which materially encroaches upon a public street and impedes travel is a nuisance per se, and may be abated, notwithstanding space is left for the passage of the public. This is the only safe rule, for if one person can permanently use a highway for his own private purposes, so may all; and if it were left to the jury to determine in every case how far such an obstruction might encroach upon the way without becoming a nuisance there would be no certainty in the law, and what was at first a matter of small consequence would soon become a burden, not only to adjoining owners, but to all the tax-payers and the traveling public as well. Thus expediency forbids any other rule. But even if it did not, the rule is well founded in principle, for it is well settled that ‘the public are entitled not only to a free passage along the highway, but to a free passage along any portion of it not in the actual use of some other traveler,’ and if this be true it necessarily follows that there can be no rightful permanent use of the way for private purposes.”
In the case of Reimer’s Appeal, 100 Pa. St. 182, it was held that a bay window in the second story of a city house, sixteen feet above the sidewalk and projecting three and. one-half feet beyond the building line, was a public nuisance, which could not be justified by ordinance and its construction could be enjoined by the public. To *282the same effect are City of Alton v. Illinois Transportation Co. 12 Ill. 38; City of Quincy v. Jones, 76 id. 231; Cicero Lumber Co. v. Town of Cicero, 176 id. 9; Snyder v. City of Mt. Pulaski, id. 397. Quoting from Snyder v. City of Mt. Pulaski, supra, we said (p. 402): “The streets of a city are dedicated for public use, and for these purposes the city council may improve and control them and adopt needful rules for their management and use. But that body has no power to alien or otherwise encumber such streets so long as they are public streets, but must hold them in trust for public uses only, and hence no easement or right therein not of a public character can be granted by a municipality or acquired by any individual or corporation for exclusive private use to the exclusion of the public. * * * A permanent encroachment upon public streets for a private use is a purpresture, and is in law a nuisance. * * * Such permission to so use the street is not binding upon the city and is not irrevocable. The municipality having no power to grant such permanent use, there can be no estoppel against it from requiring the street to be oped in its entirety, because no estoppel can arise from an act of the municipal authorities done without authority of law.”
If this ordinance is to be upheld, and is to. be construed as conferring power upon those citizens owning properties along the line of the streets to build steps out in front of each property three feet, aerial ways and stairways three feet, windows and other projections eighteen inches, pray, for whose benefit will we say these things are allowed to be done? Can it be said that such structures are of benefit to the hundreds or thousands, as the case may be, who do not own or have any interest in those homes or properties, and yet who have as much right to use the street in all its dimensions as do those who reside upon it? Can it be other than a mere private use or a use for private purposes? It matters not how many persons may build encroachments upon the streets *283under such supposed ordinance, it would still be a private use and for private purposes, in which the public could have no interest and by which the public may be greatly annoyed and inconvenienced. If it be said that city authorities can, by ordinance or otherwise, permit the erection and maintenance of a structure extending three feet or eighteen inches into the street, then where shall we say is the limit? If they may deprive the citizens of a portion of the street, then what portion? And if it be said that it shall only be that portion that does not interfere with public travel, then must each obstruction and extension be left as an open question, to be determined in each case,, as a matter of fact, whether there was an obstruction to travel and public use? If bay windows may be authorized to be extended into the street eighteen inches when near the ground, then why may not cities authorize property holders living opposite each other or property holders owning properties on each side of the street to cover the entire street, so long as they shall place their projections and obstructions high enough that the tallest man in the community, or the wagon or the biggest load that may be conceived of, may pass readily? It seems to us the very suggestion carries with it its own answer, and that there is no safe field of speculation other than to keep within the limits placed by the books, by saying that the streets in their entirety are public properties exclusively for public use, and that they, or any part of them, cannot be devoted exclusively to private purposes or private use.
With this law before us and with the views that we entertain upon the subject, as expressed in this opinion, we hold the ordinance relied on by defendants in error invalid, and it becomes our duty to reverse the judgment of the circuit court of Champaign county, and remand this cause to that court for other and further proceedings not inconsistent with this opinion.
Reversed and remanded.