Fairly common on semi attached houses - remember - your right on the property line on one side - the other house is a mirror of your's - the builder takes a 50x100 lot, and builds right on the middle - 1 "big" house - basiclly 2 small houses, with a concrete/cinder block fire wall down the middle

I lived in one foe 10 years - sold it in 2001 - for 395K!