I was really puzzled over the years as to what the Gurary family is aware of / allowing in that building. The mikvah was kept open until the first Yahrzeit, and since then it has been closed off (while various bochurim were seen entering at times through the Kingston Avenue doors).
Have heard various rumors.
One that they want to make sure no one does anything with it till they are ready to actually expand.
Opposite versions they they are waiting for the highest bidder and don't want the headache of managing it meanwhile.