Yes such a requirement is legitimate because it is associated with the sale of the apartment!
Just get your money back and clear another apartment!
Ошибка
Owner suddenly asked to terminate the rental contract
I'm currently staying in an apartment in frunzhenskaya, we signed a contract from 8th october 2015 to 8th october 2016. Today 20th November, the owner says that she wants to sell her apartment and ask us to leave by January. Is it legal to terminate the rental contract in such short notice?