There has been a lot of problem in Upkar Residency, which is one of the earlier layouts of Upkar developers.
Upkar developers should sort out the issue and clear the sites from BDA. They have really good contacts and in BDA it is all about money. If Upkar developers were really good people, without any guilt, they would have easily sorted the issue with the BDA.
I have also heard about their issues in Upkar Habitat(as one of my friend who lives in Upkar Residency wanted to buy a plot in Habitat, but dropped the plan after looking at several reviews which told that it has similar issues)