delivered the opinion of the court:
This is an appeal from the dismissal of two petitions for writ of certiorari seeking review of the subject parcels’ real property assessment classifications. Plaintiffs present two issues for review: (1) whether a common law writ of certiorari is the proper means by which to seek direct review of the legality of a decision by the board of appeals or board of review; and (2) whether the mixed Class 5 and Class 6 classification presently assigned to the subject parcels violates the Illinois Constitution, the Revenue Act, or the Cook County Real Property Assessment Classification Ordinance as amended (Ordinance No. 80 — 0—14). For the reasons which follow, we affirm.
The two cases which are the subject of this appeal involve a dispute as to the legality of real property tax assessment classifications assigned by the Cook County Assessor (Assessor) and Cook County Board of Appeals (Board of Appeals or Board) to industrial real property owned or leased by the respective plaintiffs, C & K Distributors, Inc., and Combined Warehouse Company, Inc., et al. In each case plaintiffs petitioned the Board of Appeals seeking review of the assessment established for their respective property by the Assessor. Each plaintiff requested that the established market value of its property be reduced and that its property be reclassified from its existing mixed classification — partially Class 5, assessed at 40% of market value, and partially Class 6, assessed at 16% of market value — to an entirely Class 6 property assessment classification. Upon review, the Board of Appeals established a market value in excess of that requested by plaintiffs for their respective parcels and refused to alter the proрerty assessment classifications. Plaintiff Combined Warehouse Company, Inc., then filed a complaint for tax injunction contesting the validity of the partial Class 5-Class 6 assessment classification assigned to its property. After the complaint was stricken with leave to amend said plaintiff filed an amended complaint for a writ of certiorari and plaintiff C & K Distributors, Inc., filed a complaint for a writ of certiorari for review of the Assessor’s and Board of Appeals’ actions. On December 6, 1982, the circuit сourt dismissed the complaints with prejudice. Plaintiffs’ motion for rehearing was denied by order entered January 6,1983. Plaintiffs appeal.
Opinion
The first issue raised by plaintiffs is whether, on the facts here presented, a common law writ of certiorari will lie for review of а decision by the Board of Appeals. Plaintiffs argue that the Board of Appeals exceeded its jurisdiction and that it acted illegally and, therefore, its actions may properly be reviewed under a writ of certiorari. Defendants maintain that thе Board had jurisdiction and proceeded legally in the instant case and that the writ, therefore, does not lie.
The starting point of our analysis is to determine when the writ may properly be granted. “It is the law in this State that circuit courts have the power to issue common law writs of certiorari addressed to all inferior tribunals whenever it is shown either that they have exceeded their jurisdiction or have proceeded illegally, and no direct appeal or other mode of direct review of their proceedings is provided.” (Goodfriend v. Board of Appeals (1973),
Bearing these principles in mind, we turn to the facts of the instant case. Plaintiffs herein appeal the trial court’s dismissal of their respective complaints for writs of certiorari. The question for determination is, therefore, whether the factual allegations contained in plaintiffs’ complaints, which allegations must be taken as true for the purposes of a motion to dismiss, were sufficient to state a basis for review by common law writ of certiorari.
Plaintiffs, by their respective comрlaints, in substance allege that defendant Board of Appeals both exceeded its jurisdiction and acted illegally in classifying the subject parcels as a prorata mixture of Class 5 and Class 6. Specifically, plaintiffs’ complaints contain the fоllowing factual allegations: (1) plaintiffs, through their attorney, appeared before the Board of Appeals and requested (a) a reclassification of the subject parcels from their existing classification, partially Class 5 and partiаlly Class 6, to entirely Class 6, and (b) a reduction in the 1981 market value assigned to the subject parcels by the Assessor; (2) plaintiffs’ requests for reclassification were denied, the market values of the subject parcels were reduced but the reduction was less than was requested; (3) the ordinance under which real estate taxes are assessed provides for classification of real estate, for purposes of assessment of real estate taxes, into several assessment classes which arе taxed at various percentages of market value; (4) at all pertinent times said ordinance provided for the assessment of both new and substantially rehabilitated industrial property at 16% of market value (Property Assessment Class 6) rather than at 40% of market value, the normal rate for industrial property (Class 5); and (5) the subject parcels meet the definitional standards for Class 6 contained in the ordinance. Plaintiffs also allege that a property nearby and comparable to plaintiffs was given an entirely Class 6 assessment classification. Plaintiffs further allege the absence of another method of review.
Plaintiffs’ allegations that the Board of Appeals exceeded its jurisdiction and proceeded illegally are mere conсlusions of law which need not be taken as true for purposes of a motion to dismiss. (Pierce v. Carpentier (1960),
Plaintiffs first contend that the Board exceeded its jurisdiction by refusing to alter the mixed Class 5- Class 6 property assessment classification applied by the Assessor to plaintiffs’ parcels. In support of its allegation that defendant Board of Appeаls exceeded its jurisdiction, plaintiffs argue that the power granted to an assessing official can only be exercised in accordance with the statutory requirements. Plaintiffs assert that the only valid property classifications are those spеcifically established by county ordinance and that any property classification not so established, such as the mixture of Class 5 and Class 6 applied to the subject parcels, is void. Plaintiffs further assert that, in light of the granting of an entirely Class 6 assessment clаssification to a property comparable to their parcels, the Board of Appeals’ denial of plaintiffs’ request for a Class 6 assessment constitutes “an unauthorized classification of real estate and a discriminatory taxation for which there is no basis in law” relying upon article IX, section 4(b) of the 1970 Illinois Constitution, which states that classifications of real property for the purpose of taxation “shall be reasonable and assessments shall be uniform within each class.”
Jurisdiction is authority to hear and decide a cause. (People ex rel. Raymond v. Talmadge (1901),
The allegations in the instant case do not challenge the jurisdiction of the Board to hear and rule on the cause brought before it but instead question the result obtained thereby. The gist of plaintiffs’ argument in this regard is that the Board has jurisdiction to act only insofar as its determinations were adjudged to be correct or that it had no jurisdiction to arrive at an erroneous determination. We do not adopt this limited definition of jurisdiction, however, for “ '*** [t]he rulings of a court may be erroneous and yet it may have jurisdiction and proceed legally.’ ” (Joyce v. City of Chicago (1905),
Plaintiffs also contend that by refusing to alter the mixed property assessment classification the Board failed to proceed legally and that review by common law writ of certiorari is, therefore, proper. The term “proсeed legally” in this context means to follow the essential procedural requirements applicable in such cases. (Joyce v. Chicago; Hartley v. Will County Board of Review (1982),
Plaintiffs also raise the contention that they have no adequate remedy at law and that review under the common law writ of certiorari is the only manner of review аvailable. Plaintiffs admit that it is a well-settled rule in Illinois that a writ of certiorari will not issue if an adequate legal remedy is available. (First National Bank & Trust Co. v. Rosewell (1982),
Plaintiffs’ second issue raises questions regarding the correctness of the Board’s determination and is, therefore, beyond the scope of this appeal.
For the foregoing reasons, we affirm the judgment of the trial court.
Affirmed.
SULLIVAN and O’CONNOR, JJ., concur.
