As a reader pointed out to us last week, markings appeared on the sidewalk outside the building on the northeast corner of 3rd Street and 3rd Avenue pointing to the location of gas and sewer lines, which usually happens before a demolition. And that’s the case here: Con Ed, which owns the property, plans to demolish the warehouse this fall. A spokesperson says they haven’t decided what they’re going to build in its place yet. The most interesting thing about this property is that it’s connected to a wall that some believe was part of a ballpark the Dodgers played at before Ebbets. (Others are not so sure, though most baseball historians think it’s an important structure regardless of whether it’s Dodgers-related or not.) In any event, the Con Ed spokesperson said the wall, which mainly runs from 1st Street down to a section of 3rd Avenue, will not be harmed by the warehouse demolition. GMAP DOB