Is a warrant valid for the entire premises of a single family residence, even though probable cause exists to search only one unit?

"A search warrant for the entire premises of a single family residence is valid, notwithstanding the fact that it was issued based on information regarding the alleged illegal activities of one of several occupants of a residence." United States v. Ayers, 924 F.2d 1468, 1480 (9th Cir. 1991). By contrast, if a warrant authorizes the search of separate apartments or units, even though probable cause exists to search only one of them, the warrant is overbroad. See id. A search conducted pursuant to such a warrant is unreasonable unless "the officers' failure to realize the overbreadth of the warrant [is] objectively understandable and reasonable." Id. (quoting Maryland v. Garrison, 480 U.S. 79, 88 (1987)).