Construction finally began at 113 Nassau Street?where a bunch of lots were combined in 2007 for a 28-story residential tower?just this past September. Now a tipster passes along the first rendering we've seen of the project, via the Cooper Union website (one of the school's professors appears to be involved). "It looks decent for a new construction, with very nice corner units on the top floors," is our tipster's capsule review. The building is listed as 30 stories, and indeed, DOB permits indicate that the building is set to be two stories higher than originally planned. We're not sure whether the apartments will be rentals or condos. Anyone know? Please tell us!