Developer Gerald Hines added a lake to a 32-acre slice of woodsy Memorial back in 1978. Around it, he built Ethan’s Glen, a townhome community with 288 units divided into 2-building clusters of quadplexes. One of the enclave’s larger units came on the market earlier this month, asking $275,000. The 2-story townhome, which has east and north exposures, retains some of that seventies style, such as rough-hewn cedar siding outside and a living room with walls of rustic planks installed in a herringbone pattern. But it also has new paint, new bathrooms, and new, as in last month, carpet upstairs.