In January I noticed that the owners of two buildings on Third Avenue (577-579) & a lot on 16th, purchased in 2015 for over three million dollars, were attempting a flip, with the properties listed for $6,900,000, and plans for a seven-story residential building filed. Plans still await approval, and no new property sales have been recorded. Demolition's on the way though.
Here's a better look at the stretch of small, pre-1880 rowhouses between 15th & 16th. 579 is at left.