Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
real estate n недви́жимость f
cpd (US)
real-estate agency аге́нтство по прода́же недви́жимости, риэ́лтерское аге́нтство
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.