So, we installed: a simple timber retaining wall along the west property line, a much more elaborate split-faced right-angled concrete block wall at the backyard's north end, and quarter-circle steps. Two separate brick paved surfaces, one for dining and one for pots. A Pennsylvania bluestone flagstone area, with the joints filled with creeping groundcovers. We planted large, shade-tolerant shrubs along the east and south perimeter. And finally, the Playhouse was lowered to the ground level in a painstaking and stress-inducing manner, using eight columns of individual concrete blocks, four automotive jacks, four blocks of 6x6 timber and many prayers. And it worked!