The opposition parties at City Hall have called on the mayor to back tighter controls on residential sales to overseas buyers. Galliard Sales Director David Galman said 70% of properties at Royal Gateway had been sold to domestic buyers.
David Galman said "off-plan" sales were an essential part of persuading banks to fund a development before building work could start.
More top news
The web designer went on the run a year ago before he was convicted, in his absence, of killing his 24-year-old date Charlotte Brown.
It's reported the elderly victim was pressured into handing over her mobile phone, bank card and £20 by a woman posing as a social worker.
Both victims were pronounced dead at the scene.