delivered the opinion of the court:
The city of Chicago claims to be the owner in fee of the locus in quo by virtue of a dedication of the land for streets by the plats set out in the foregoing statement. It is admitted that the plats in question were properly executed under the statute and constituted a valid offer to dedicate the premises designated as streets on said plats. Sheffield’s plat was made in 1853 and the Chicago Land Company’s subdivision in 1856. There is no proof in the record of a formal acceptance of the offer to dedicate under either of these plats. Whether there was an implied acceptance by the city is a question upon which both parties have offered much testimony and have argued that issue elaborately in their briefs. The validity and effect of the vacation deed of appellee on September 17, 1898, is also a question which is the subject of extended argument by both parties in this court. In the view that we take of this case it will not be necessary to consider any of the foregoing questions.
■In 1857 these additions were not inside the corporate limits of the city of Chicago. The territory was open, unimproved prairie, and there were no houses or other improvements in that vicinity. Up to this time the execution and filing of the two plats of 1853 and 1856 was all that had been done looking toward building up the addition. In 1857 O. W. Porter, representing E. D. Ward of Detroit, commenced the construction of a rolling mill on the west side of the Chicago river on the property designated as lot A of block 17 or sub-lot B of lot 1 of block 18. The exact location of this building is not clearly pointed out by the evidence. For the convenience of the mill owners in getting material to construct the mill a dock was constructed at the end of Wabansia avenue. The building material was brought tO‘ the dock on scows. When the mill was completed it became necessary to construct dwelling houses for the mill employees. The houses, and also a boarding house for the convenience of the mill employees, were erected along the extension of Wabansia avenue between McHenry street and the mill, and a sidewalk was built in front of these houses. These buildings were constructed by the mill company for its own benefit, and neither the city nor the public appears to have had anything to do with them. Later, when the lots occupied by the houses were required for extensions of the mill property, they were torn down and moved away by the company and the plant was extended west to McHenry street. After the extension of the plant to McFIenry street the mill premises were enclosed by a fence, and a sign was erected at the west end of tract B warning all persons other than employees to keep out, and the mill company kept a watchman stationed there to enforce this warning. The evidence shows that the mill company and its successors have had exclusive, open and uninterrupted possession of all of the premises lying east of McHenry street to the Chicago river and north of the south line of lot 1 in block 18 to the river. After the removal of the cottages and extension of the plant to McHenry street the strips of land representing the extension of Wabansia avenue east to the river and the extension of McHenry street north to the river, designated B and A, respectively, have been occupied and used by the. company under a claim of right in the same manner and to the same extent that it used other portions of its mill site. Railroad tracks have been laid wherever the convenience of the mill company required them, regardless of whether they were in or out of the supposed streets. There appear to be some eighteen or twenty railroad tracks and spurs that traverse some portion of Wabansia avenue east of McHenry street. The south end of the north rail mill extends practically to the center of Wabansia avenue, and the south mill, another extensive building of the mill company, is immediately south of the north rail mill but not upon any portion of the street. The evidence shows that the blast furnaces, the rail -mill, the Bessemer steel mill and other parts of the plant were located in close proximity to each other, some upon one side and some upon the other of the alleged street, and that the location of the different mills is such that if Wabansia avenue were opened up and used as a public highway the plant would be rendéred inoperative. The space in Wabansia avenue between the rail mill and the south mill is occupied by railroad tracks, weighing offices, rail-loading docks, turn-table, and other things pertaining to the finishing and delivery end of the rail mill. The rail mill and the south mill were both operated from the same steam supply. The conditions are such that it would be utterly impossible to operate the plant without re-constructing it if Wabansia avenue should be opened up as a street to the river. We have no means of knowing the amount invested in these various buildings and appurtenances in connection with this plant, or how much it would cost to re-construct the same if the street in question were opened up. It is stated by counsel for appellee that the plant represents an investment of millions of dollars. It is apparent that appellee’s plant represents a very large amount •of money, and it is not pretended by appellant that the opening up of the proposed street will not entail upon appellee a very heavy loss. During all of these years, from about 1859 to the beginning of this suit, the municipality of Chicago has stood by and by its silence acquiesced in the occupation by the appellee and its predecessors of the street in question, knowing that appellee was investing large sums of money on the faith and belief that there was no street there, or that if there ever had been one it had been abandoned by the city. Under these facts appellant is equitably estopped from insisting that appellee’s buildings and other structures constitute an obstruction to the highway.
The case of Reichert Milling Co. v. Village of Freeburg, 217 Ill. 384, is a case very much like the case at bar and announces the principle that must control here. The same principle has been applied in many other cases in this court. (Village of Winnetka v. Prouty, 107 Ill. 218; Village of Auburn v. Goodwin, 128 id. 57; Village of Vermont v. Miller, 161 id. 210; Jordan v. City of Chenoa, 166 id. 530; City of Carlinville v. Castle, 177 id. 105; People v. City of Rock Island, 215 id. 488.) In the case last above cited this court, on page 495, said: “It has frequently been decided that the doctrine of estoppel in pais is applicable to municipal corporations, but that they will be estopped or not, as justice and right may require. There may be cases where, under all the circumstances, to assert a public right would be to encourage and promote a fraud. Where a party acting in good faith under affirmative acts of a city has made such extensive and permanent improvements that it would be highly inequitable and unjust to1 destroy the rights acquired, the doctrine of equitable estoppel will be applied. The hardships that would result from a contrary holding, and the necessity of raising an estoppel in particular cases ho prevent fraud and injustice, have induced the establishment of the rule, and it has been several times said that there is neither danger to the public nor injustice in the application of the doctrine. In the exercise of proper diligence the public authorities may prevent encroachments upon public right, and if they do not, any citizen may take the necessary steps to do so, and if there is not only a failure to act by either, but affirmative action by the public authorities with the apparent approval of every one interested, under which the situation is changed and permanent improvements are made, the principles of equity require that the public should be estopped.”
Municipal corporations are not within statutes of limitation except as to private right, but courts of equity will prevent the operation of this rule by enforcing an equitable estoppel where to permit the assertion of a right in a street after long acquiescence in the expenditure of money in the erection of buildings there would work a gross injustice to the rights of private persons. The facts bring this case within this rule, and there was no error in granting a perpetual injunction by the court below.
The decree is affirmed. Decree affirmed.