query about the construction

Gulshan-e-Iqbal

I have a query regarding this house about its construction. is it an old construction or new? or not very old? secondly pls tell about its accurate measurements (in square yards) because there is a contradictory in 2 units of measurements defined in the post IE; KANAL & SQUARE YARDS 1 KANAL IS EXACTLY EQUAL TO 605 SQUARE YARDS BUT HERE IT IS MENTIONED 1 KANAL & THEN MENTIONED 500 SQ. YARDS.