For a quiet gated block, the Upper West Side's Pomander Walk sure has been seeing a lot of action lately. A one-bedroom apartment on the street?built in 1922 to resemble the London set of a play, Pomander Walk?popped up asking $449,000 a few weeks ago. Now one of its neighbors, a 2BR, is also on the market. This place is asking $725,000 (maintenance: $1,232/month). The listing, with just a few photos and no floorplan, is sparse, but we know the apartment is on the small side at 700 square feet. Par for the course on Pomander Walk.