delivered the opinion of the court.
None of the questions discussed are worthy of consideration except the liability of the city for a change of grade. The objections that witnesses were permitted to give their opinion as to the amount, and to the instructions of the court on the measure of damages are not serious; though the form of some of the questions may be technically improper. The court substantially submitted the case to the jury, and permitted evidence to be introduced, upon the theory *109that the measure of damages Was the diminution, if any, of the actual market value of the premises occasioned by the change of grade. That is to say, the damage, if any, was the difference between the market value of the premises before and after the streets were leveled in accordance with the change of grade. This was correct. ■
The important and vital question is whether any liability of the city has been shown. It is the contention of plaintiff that under sec. 15, art. II. of the constitution declaring “that private property shall not be taken or damaged, for public or private use, without just compensation,” her property has in the constitutional sense been damaged. The position of defendant is that since the power to grade and improve streets is vested in the city and is a continuing power, of the necessity for, and expediency of, the exercise of which the city alone is the judge, unless by constitution or statute compensation is expressly awarded for changes resulting from such public improvements there can be no recovery. The claim is also made that under previous decisions of this court a reasonable change'or improvement in a street, such as this is, though it may result in consequential damage to the abutting owner, entails no liability therefor upon the municipality. That it is only for an unreasonable use, or capricious change of grade, or for the negligent or unskilful manner in which the work of changing the grade is accomplished that the city in any event may be charged. The decisions referred to, which we will have occasion to mention later, are: City of Denver v. Bayer, 7 Colo., 113; City of Denver v. Vernia, 8 Colo., 399; Denver Circle R. R. Co. v. Nestor, 10 Colo., 403; City of Denver v. Rhodes, 9 Colo., 554; Aicher v. City of Denver, 10 Colo. App., 413; D. S S. F. R. Co. et al. v. Domke, *110et al., 11 Colo., 247; Gilbert v. Greeley S. L. & P. Ry. Co., 13 Colo., 501; Pueblo v. Strait, 20 Colo., 13, 19.
All the authorities say that at common law, and in the. absence of statutory or constitutional authority, a municipality in a case like the one at bar is not liable. 2 Dillon on Municipal Corporations, 4th ed., §§ 686, and 989-995.
In 1870 there was inserted in the constitution of the state of Illinois a section that “private property shall not be taken or damaged for public use without just compensation.” In Rigney v. City of Chicago, 102 Ill., 64, by a divided court, it was held under this • clause that an abutting owner might recover in cases where “there is a direct physical obstruction or injury to the right of user or enjoyment, by which the owner sustains some special pecuniary damage in excess of that sustained by the public generally, which, by the common law, would, in the absence of constitutional or statutory provisions, give a right of action. ’ ’ And in applying that principle the city was held liable for constructing a viaduct upon a public street near its intersection with another street, thereby cutting off access to the plaintiff’s house and lot from •and along the street intersected. Since that time the states of Alabama, Arkansas, Californa, Colorado, Georgia, Kentucky, Mississippi, Missouri, Montana, Nebraska, Texas, Washington, and possibly others have adopted similar provisions, and the courts of last resort thereof have followed the construction given by the supreme court of Illinois in the Bigney ease, as will be seen by the following, among other cases that might be cited: Harmon v. City of Omaha, 17 Nebr., 548; Hammond v. Harvard, 31 Nebr., 635; Worth v. City of Springfield,, 78 Mo., 107, 110; Gibson v. Owens, 115 Mo., 258; Mayor of Vicksburg v. Herman, 72 Miss., 211; City of Ft. Worth v. Howard, 3 Tex. Civ. App., 537; Beardon et al. v. City and *111County of San Francisco, 66 Cala., 492, 504-5-6; Eachus v. Los Angeles Co., 103 Cala., 614; Brown v. City of Seattle et al., 5 Washington, 35; O’Brien v. City of Philadelphia, 150 Pa. St., 589.
For a collection of other cases see Dillon on Municipal Corporations, 4th ed., §§ 989-995; Lewis on Eminent Domain, § 223.
It would serve no useful purpose to review in detail all of these decisions. Some of them hold that a city is liable in damages to the abutting owner of land on a streePthe grade of which has been reduced from the natural surface, whether it be the one first established or for a change of a previously established grade. Others seem to restrict liability to cases where there has been"a change of a previous grade, and to exempt from the operation of the constitutional provision the first reduction of grade from the natural surface.
It would seem under all the authorities, at least aside from those of our own state, a fair construction of this constitutional provision that for damages such as plaintiff has suffered the city is liable. Judge Dillon’s summary of the doctrine is this:
“Although sensible of the apparent difficulty of defining the grounds for the distinction, it seems to us, jwhefe a grade line has been officially established and where property has been improved on the faith of it (which is, of course, done-on the assumption that the grade is permanent, although the power to change it for the public good exists), that such a case rests upon so strong a basis of natural justice as to bring it within the purpose of the constitutional provision in question, which wás to prevent the unequal sacrifice for the public good which in such cases the abutting owner was, by the established course of decisions, required to make. ’ ’ He would make the municipality liable for consequential damages in that class of cases, *112but not “for reducing the natural surface of the street-in the course of its normal and ordinary improvement for street purposes proper to a grade line for the first time established.” 2 Dillon on Municipal Corporations (4th ed.) § 995 b.
The only embarrassment under which we labor is that there are found in the opinions of this court in the cases above cited statements which, though not strictly germane to the points decided, give color to the contention of defendant that a municipality is not liable to an abutting owner for an ordinary use of, or reasonable change of grade in, the adjacent street. In the Bayer case, in a well-reasoned opinion by Mr. Justice Helm, the only proposition decided was that the use of a street by a steam railroad was not such a use as was contemplated by the lot owner when he purchased, or by the dedicator when he made his dedication, and therefore that such an incumbrance on the street gave him a cause of action. In illustrating the general subject the learned judge proceeded to say, nowever, that there were interferences and resulting injury to property of an abutter, even in this state, which were held to damnum absque injuria, where they were occasioned by a reasonable improvement of the street by the proper authorities for the greater convenience of the public, and the learned judge then said: “In determining what changes and improvements are most conducive to this end, the council exercises a large discretion. And unless unreasonable changes are made, or injury results to the adjoining premises through the unskilfulness or negligence of those employed, the owner thereof will not be heard to complain, though, in fact the real value and convenience of his property are diminished thereby.”
The reason therefor was thus stated: “The abutting owner may well be presumed to have taken into consideration the fact that the grade of the street *113might be raised or lowered; that pavements might be laid and bridges and culverts constructed, and that a street railroad even might- be built and operated thereon; and it may fairly be presumed that in purchasing he anticipated and allowed for the possible or probable damages to result from these and similar changes, or that he signified his consent thereto, and thus deprived himself of any right to compensation therefor. ’ ’
This language, it is to be observed, was not absolutely necessary to the decision of the particular point-determined ,• but it was used to illustrate the different consequences between an ordinary and extraordinary use of streets by the municipality. The language was certainly appropriate as argument, even if not indispensably necessary to the decision. Possibly it was dicta; but while dicta, it is entitled to the consideration which sound reasoning merits. We also remark that no attempt was made' to define a reasonable use or a reasonable grade or change thereof.
This language is referred to with approval in a number of the other cases cited, but it is this case upon which the city chiefly relies. If thereby the court means to say that a reasonable use, or the establishing of a reasonable grade of a street is one that entails no practical damage, or if the intention was to hold that for the first establishing of a grade the city was not liable for the consequential damage, if any, the doctrine is not opposed to the view announced by Judge Dillon. Indeed- we think that every statement of this court upon this general subject, found in the reported decisions, can be harmonized with the conclusion of thaj learned author. But we do not understand that this court has ever declared that ne recovery could be had by an abutting owner whose property was materially diminished in value as the result of a change of the grade of an adjacent street by low*114ering or elevating it from a previously established grade in accordance with which the owner had made valuable improvements. We the more readily reach this conclusion since Chief Justice Beck, in the Vernia case, after commenting upon the Bayer case says: “It is unnecessary to consider the question whether the establishing of such a grade, and carefully reducing the street thereto, would present such a case of injury to the abutting lot-owners who had purchased property on the street and erected improvements thereon before such grade was established, but with reference to an existing grade previously fixed by ordinance, and the street reduced thereto, for no-such case was here made out. ’ ’
This observation shows that the court then did not suppose that in this jurisdiction there existed, or at that time there was being enunciated, any such rule as the city in this case contends for. We think a careful examination of the other cases will show that no such principle has been laid down. In line with this conclusion our court of appeals, in the Aicher case, at page 418, speaking by Mr. Justice Bissell, said: “A case is not presented which calls on us to determine how far, if at all, the city would ever be liable for an alteration in its grades, nor how far it must respond for resulting injuries. ’ ’
The question therefore we consider an open one in this state. While no attempt is made to lay down a rule applicable to all cases, the wiser course being to determine each one as it arises, we are of opinion that under the facts of this case, which are that plaintiff made improvements upon her lots upon the faith of, and with reference to, what she supposed was the permanent grade of the adjacent streets in accordance with the ordinance of 1887, and that the change of grade authorized and carried into effect under the ordinance of 1897, damaged her property in the con*115stitutional sense, since its market value was thereby materially impaired, the defendant should respond in damages. If the Bayer case is applicable, then by reading it in the light of the test furnished by Judge Dillon, we might well hold that, under the doctrine there announced, the change of grade from a previously established one was, as matter of law, in the circumstances of this case, 'unreasonable for which recovery for the consequential damage may be had.
The judgment is therefore affirmed.
Affirmed.
Mr. Justice Steele' not participating.