The US tax policy is beneficial towards real estate in general- you can debate the reasons why but some things that are commonly brought up:
1) real estate is relatively illiquid, which encourages long term investment
2) real estate is culturally significant as it differentiates us against the British
3) real estate is the primary source of gaining wealth for the middle class in the US
4) real estate ownership encourages community involvement
TOTALLY debatable, but Real Estate is 100% given preferential treatment so far as investments go