One could raise quite a brood in the 4,500 square foot 5BR/4BA full-floor penthouse at 109 West 26th Street, just on the market for $7.9 million. The co-op unit includes a 1,500 square foot roof deck with a gazebo and children's play area. What, no retractable dome? That's ok. On rainy days, junior can hang out in his bedroom that features a climbing wall in one of the broker photos. This building is located mid-block on 26th Street and has 11 other units. 109 West 26th St. isn't a doorman building, but there is an extensive security system.