The following text is from the original listed building designation:
1. 5277 WINDMILL STREET (East Side)
Public Library TQ 6474 SE 1/206
II GV
2. Built 1905 and given to the Borough of Gravesend by Andrew Carnegie. 2 storeys brick with stone dressings. Consists of a centre and 2 flanking wings. The centre portion has a stone modillion cornice and 3 sashes in moulded architraves with glazing bars intact. The ground floor has 4 Tuscan half-columns with round-headed windows between. Plinth. The wings of 1 bay each have parapets with curved open pediments containing shields with the cartouche of the City of Gravesend. Pilasters with shields and wheat-ear drops on the capitals. 1 sash each with glazing bars set in moulded surrounds. Stringcourse between ground and 1st floor. The left side portion has a round-headed window with keystone and swag moulding. The right side portion has an open pedimented stone doorcase. This has pilasters with mermaid caryatids.
Forms a group with Nos 1A, 2A, 3A, 4A and 5A which are local interest buildings.
Listing NGR: TQ6479474118

Description from record :
First World War anti-Zeppelin observer patrol headquarters located in part of Gravesend Public Library, Windmill Street, Gravesend. The chief observer was the Head Librarian who based his patrolling observers in an unknown part of this Victorian library. Such use dates from 1915, a termination date being unknown, but probably 1918. The library still exists.
Owner : Public
Publicly accessible : Yes
How accessed for survey : Much of the building is accessible during its opening periods as a library.
Tourism Potential : Limited potential as a point of interest to point out within a defence heritage trail
Condition : very good
Date of visit : 15/03/06

Smith, V.T.C., 15/03/06, Gravesend Library First World War anti-Zeppelin patrol HQ, Windmill Street, Gravesend (Photograph). SKE13775.

Gravesend Council, 25/06/1915, Minutes of Gravesend Council's Library Committee (Bibliographic reference). SKE13729.