The logistics of the ground-zero revival effort are enough to make one’s head implode, but that’s not stopping JPMorgan Chase from getting into the game. The bank has expressed interest in the Deutsche Bank site, a piece of real estate that’s about to open up with the final dismantling of the grim, toxic colossus. Early plans call for a 50-story tower of comparable dimensions. Whatever Chase builds there is probably bound to be more eye-pleasing than the current black obelisk; the question here, like everywhere else around the ground zero, is whether anything is going to be built at all. For one thing, Chase wants a big, fat incentive package to move its employees south from midtown. For another, to fit in a trading floor, the building will need to “cantilever” (thanks, Times; we’d probably say “partly hang”) over a little park. And that means community boards may be getting involved. Unlike the dome over the transit hub and other semi-scuttled flights of fancy, this one is a deal-breaker: No cantilevering, no trading floor; no trading floor, no dice. Without taking sides, we’ll just say this: Chase execs better pray there are no memorials planned for that park.