Blackstone defaulted on the $308 million mortgage on a Manhattan office tower more than a year ago — and the debt is now up for sale at a discount of more than 50%. ... The skyscraper has been losing value since 2014, when the mortgage was originated and 1740 Broadway was appraised at $605 million, ... Blackstone ceased funding operating shortfalls at the building and stopped paying the mortgage as of March 2022,.. Midland, however, has yet to foreclose on the tower, though it’s unclear why. ... As of September 2023, the occupancy at 1740 Broadway was a mere 7.4%,...