Tom Anderson wrote:

Presumably built between two aerial photos of the area being taken or
something.

I found an estate with no rooves on... it looks like one of those diagrams
you see in estate agent windows.

http://maps.google.co.uk/maps?hl=en&...&t=k&z=19&om=1

If you look at the same estate in Windows Live Local, the Birds Eye Views
show the estate completed, but the plan view shows the stuff that was
demolished to make room for it.