Now in discussion with the buyer, the investment and management company is still waiting for £52 million.
It has announced it was "in discussion with the purchaser in order to ensure that the optimum real estate and financial solutions are achieved".
Brent Council gave the scheme the go-ahead in 2006, with plans agreed for 300,000 sq feet of internal retail space and private housing.
The site has planning permission for 500 new apartments set within a series of towers and was sold to a consortium led by a private investor.
As payments have been missed three times, the loan has now not been extended – although Development Securities does still hold the £68 million deposit, which is non-refundable.
Invariably, new offices in London are situated in tower blocks as developers try to maximize space.
