Is that an extension to the Aston Hotel that backs right on to (ie semi detached to) the Warehouse?
They're going to love having gigs with 5,000 people at them the other side of their walls.
I went to a party there is the final few months before it closed, the management was using it as a contractors hotel/digs and those were extra bedrooms. To be honest I cant ever remember it having any 'former glory' for it to return to.