The 16,000-square-foot home at the posh address of 119 Carnarvon is on the market for just under $20 million. (Photo by TK Images) It would appear that when Murphy Mears Architects was tapped to design a Houston mansion at 119 Carnarvon for a deep-pocketed client, lavish entertaining and plenty of room for house guests were key. Consider the second-floor ballroom, a theater room, the seven bedrooms and the nine full bathrooms in the lavish 16,118-square-foot home that anchors two verdant acres in one of the city’s most exclusive neighborhoods.