I had a cutout in a three family that was converted to condos. the condo association has several buildings & a maintenance dept. the maintenance folks set up a scaffold for me. that really made the job easy. in the st louis area a lot of pre 1940 buildings have cold boxes in the kitchens. there is a wood panel on the outside below the window creating an insulated cabinet that was used for storing butter & milk in the winter. some of the panels ( on the 1st floor ) were hinged so the ice man could put ice in it from the outside. these spaces are favorites for bees. turns out there were 2 hives. one on the 2nd floor & one on the 3rd.