Wiktionary
gate house
alt. A structure located at an entrance to a large property, especially a dwelling. n. A structure located at an entrance to a large property, especially a dwelling.
Wikipedia
Gate House (Jupiter Island, Florida)
The Gate House is an historic single-family home located at 214 South Beach Road in Jupiter Island, Florida. On November 21, 2001, it was added to the U.S. National Register of Historic Places. For several years, it was owned by Edsel Ford.
Usage examples of "gate house".
You must've been sitting in the Denver gate house, to get here this fast.
This was the new gate house he was in, the one opened for traffic in '68.