At
Defined in 1 dictionary — Ballentine's (1916)
Ballentine's Law Dictionary
James A. Ballentine · 1916
When applied to a place is not definitely locative, but primarily expresses the relation of presence, nearness in place or direction, and is less definite than “in” or “on.” See Ann. Cas. 1912B, 106.1; also 123 Am. St. Rep. 17, 10 L. R. A. (N. S.) 204.