https://en.wikipedia.org/wiki/Off-plan_property
has russian version:
https://ru.wikipedia.org/wiki/Off-plan
This looks strange for me. I thought it is: https://ru.wikipedia.org/wiki/%D0%94...82%D0%B2%D0%BE
this page doesn't have reference to english version... Maybe it is real meaning? I never heard of "off-plan строительство", but "долевое строительство" is everywhere.