Work’s progressing on Issac Katan’s building on 4th Ave. between 12th and 13th, a big baby that’ll have 135 units when all’s said and done. Aside from a rumor that this place was going to host an Olive Garden, there’s precious little info out there about 500 4th. So we wonder: Condo or rental? On the pro-condo side, Katan had a hand in another 4th Ave. condo, the Novo, and sales at the most recent non-rental on the strip, the Argyle, are none too shabby. On the pro-rental side, though, we’ve got today’s market, the fact that Novo sales have been fairly lackluster, and a lack of marketing for the building so far. Seems to us like this one could go either way. Your $.02, please: