Growing castor beans for ricin?
There are no greenhouses on Boyle St. in the central North Side of Pittsburgh. Glass just isn't that practical of a building material over there, in fact many of the property owners in that district prefer plywood as a material for their first floor windows.
It's undoubtably a green house, a brick house painted green or perhaps a house with green aluminum siding. Although probably the former as brick houses are more prevalent than frame houses in that part of town.