Well, they have all of that now less the daycare. They have been able to use (legally or otherwise) the public street of Westbourne Plc. for very short-term storage of big loads coming in by trailer.
I would think they'd need that surface parking at the back near the loading dock(s) to load up incoming plumbers' trucks.
I think the real issue here will be the building costs. Building 175 underground parking spaces isn't going to be cheap and I am hearing numbers between $30 and $35 sq/ft being tossed around for the office space. If that is correct, that would make it some of the priciest space in the area and there is lots of inventory available.