Definition from Wiktionary, the free dictionary
Alternative forms 
- præmises (archaic)
- (plural only) land, and all the built structures on it, especially when considered as a single place.
- (law) (plural only) The subject of a conveyance or deed
Meaning #1 arose from owners of real property finding the word in their title deeds, where it originally correctly meant "the aforementioned; what this document is about", from Latin prae-missus = "placed before".
- (logic) Plural form of premise
land, and all the built structures on it, considered as a single place