Greater Washington has some noteworthy homes: famous rowhouses, grandiose mansions, historic cottages— you name it. But the list wouldn’t be complete without a unique Bethesda residence called “Treetops Greenhouse.” It looks how it sounds. Trees wrap around the property at 7118 Glenbrook Road, which sold this year for $6.5 million after hitting the market April. The house’s design is as interesting as its story.