It’s a Friday afternoon in Fair Oaks, and Marty Maskall wants to show off her pool. Well, it’s not her pool, exactly; it also belongs to her neighbors. And it’s not yet ready for splashing around, but once it’s up to code and filled with water, she knows it will be a big draw for adults and kids alike. The pool, at the edge of an adjacent clubhouse, is just one gathering place at Fair Oaks EcoHousing, a new 30-home cohousing development tucked away on 3.7 acres near Sunrise Boulevard. The two-story clubhouse is empty today and has been since residents