Plaintiffs sought a writ of mandamus against defendants to compel the issuance of a building permit for the construction of a service building to he used in conjunction with a proposed trailer park. Defendant building inspector had denied the requested permit because plaintiffs’ land was not zoned in a classification under which the township zoning ordinance permitted trailer parks. Alleging the invalidity of the zoning ordinance, plaintiffs filed this action.
At the close of plaintiffs’ proofs in a nonjury trial, defendants moved to dismiss. The trial court took the motion under advisement and defendants put in their proofs. Briefs were filed and the trial court’s written opinion held that defendants’ motion to dismiss should have been granted. Judgment entered in favor of defendants and, on grant of their application for delayed appeal, plaintiffs appeal.
November 4, 1966, plaintiff entered into a land contract for the purchase of the land in question with the intention of developing a trailer park thereon. Thereafter plaintiffs learned that the land contract vendors had no title to the land, and the *200contract was rescinded. December 9,1968, they took title by deed from the owner. Plaintiffs knew prior to purchase that the land was zoned agricultural residential and that trailer parks were not permitted in this zoning classification. March 5, 1969, plaintiffs applied for the building permit.
The trial court properly held that to be entitled to the writ, plaintiffs bore the burden of establishing that they had a clear legal right to establish a trailer park and that defendants had a clear legal duty to issue the requested permit. Rottman v. Township of Waterford (1968), 13 Mich App 271.
In order to establish these factors on the issues framed, plaintiffs bore the burden of proving the invalidity of the ordinance because it was not adopted according to a basic plan as required by MCLA § 125.273 (Stat Ann 1969 Rev § 5.2963 [3]); or that as applied to plaintiffs’ land, the zoning ordinance was arbitrary and unreasonable because it bore no real and substantial relationship to public health, safety, morals, or general welfare, or because it deprived plaintiffs of property without due process of law.
On the basis of detailed findings of facts amply supported by the record, the trial court correctly concluded that plaintiffs had not met the burden that was theirs.
Affirmed with costs to defendants.