annex (something) to
To legally join tracts of land. In order to make such drastic renovations to your home, you'll need to annex more land to your lot.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
annex something to something
[for a governmental body of a town or city] to attach a parcel of land onto an existing parcel of land through legal proceedings. The village annexed some adjacent land to itself. The adjoining lot was annexed to the site to allow for a bigger building.
annex to something
[for the owner of a parcel of land] to have land attached to an adjacent town or city. Our community doesn't want to annex to Adamsville. The town voted to annex to the neighboring city of Smithton.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.