TN UHB identifies 20 reconstruction sites statewide for 2026-27, plus two greenfield settlements in Perambur and Madurantakam, urging vacate for safety. CHENNAI: The Tamil Nadu Urban Habitat Development Board (TNUHDB) is set to reconstruct 12,648 tenements across 20 project sites in the state, at an estimated. CHENNAI: The Special Intensive Revision (SIR) work at the sites where old Tamil Nadu Urban Habitat Development’s (TNUHDB) apartments have been taken up for reconstruction is.