WLVI's transmitter building is at 140 Cabot Street, Needham, across an access road from WSBK at number 142. WBOS and WBMX allegedly also have, or had, facilities in this building, but I was never able to locate any FM bays on the tower. It would make sense for WBMX, at least, since they do not have a backup site, but with WBOS now primary on the Prudential Tower with backup at FM-128 it seems unlikely that they would need a backup here as well.
Copyright 2003, Garrett Wollman. All rights reserved. Photograph taken 2003-05-17.