The Lake District: not a place San Franciscans expect to see a lot of new developments, so news of an upcoming 300 Cornwall project gets Curb’s attention. The building is under construction at the intersection of 4th Avenue and California Street. What’s coming? Six townhomes, with two or three bedrooms each, and up to 1,650 square feet. Features will include natural wide-planked floors, Venetian marble, radiant floor heat and thermal solar hot water heating. Coming soon.