House Nos. vs Houses No. vs Houses Nos.

[Lission]

1. House Nos. 1, 2 and 3 are vacant.

2. Houses No. 1, 2 and 3 are vacant.

3. Houses Nos. 1, 2 and 3 are vacant.

Which sentence is correct?

Many thanks.

[Mister Micawber]

All would find acceptance; however, if we expand the abbreviations, 'house' is an adjective-- 'house numbers'.
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Native English teacher at Mister Micawber's