Washington County brought an action in equity for abatement of a nuisance, seeking an injunction pursuant to ORS 215.180① and 215.185.②

The complaint alleged that defendants owned real property in Washington County; that the property was zoned residential (R-10); and that the property was being utilized as a multiple family dwelling in violation of Sections 602, 613 and 2500 of the zoning *355code of Washington County, which allowed only single family dwellings in an R-10 zone. Testimony at trial indicated that the house in question had a small hut complete living unit with kitchen and separate meter for electricity, separated from the larger part of the house by a carport. The main portion of the house had its own kitchen.

After trial, the circuit judge entered a decree that:

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“* * * Defendants, their heirs and assigns are now and henceforth forever restrained from the use, rental or lease or both, of the premises located at:

* * [legal description]

as a dwelling for more than one family or as a duplex or two family dwelling or any such use as defined by the Zoning Ordinance of Washington County, duly enacted August 19, 1959, August 15, 1962 and as amended so long as the zoning for such property prohibits such use.

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On appeal defendants do not attack the scope of the injunction, but only its entry.

Defendants’ contentions on appeal can be summarized as follows: (1) defendants had no knowledge that the premises were being used in violation of the zoning code; and (2) assuming that the defendants knew that their tenants were using the premises in violation of the zoning code the defendants are not legally responsible for the tenants’ acts. There is ample evidence in the record to show that over a substantial period of time, and continuing through a period of investigation by the county, and at least until just before suit was filed, the premises had been occupied in violation of the zoning code.

*356.One of the defendants testified that any violation was without defendants’ knowledge. We need not here decide whether actual knowledge by an owner that bis tenants are making an unlawful use of his property is a necessary prerequisite to an injunction. While one of the defendants testified that any violation was without defendants’ knowledge, the trial judge apparently did not accept this evidence, and he was not bound to do so^—and we find nothing in the record that leads us to a contrary conclusion. Under the circumstances, the trial judge was justified in entering the injunction, particularly since it is enforceable as to defendants by its terms only in the event of acts done with the knowledge and consent of the defendants.

Affirmed.