FACTBOX-Spain's troubled property sector

* House prices in Spain will fall up to 30 percent in real terms within three years, according to Colonial (COL.MC). Click on [ID:nL085766]

* Building permits for new Spanish homes fell 60 percent in the first quarter from the same period of last year, Development Ministry data showed. Click on [ID:nL29813453]

* Moody's Investors Service has put about 16.9 billion euros ($26.53 billion) of Spanish residential mortgage-backed securities under review for possible downgrades after adjusting for rising default rates and slowing house price growth. Click on [ID:nL23519410]

* Over 90 percent of Spanish mortgages are at a variable interest rate, making mortgage holders more vulnerable to the European Central Bank's current monetary tightening policy.

* Mortgage rates in Spain currently average around 6 percent, compared with 3.3 percent in June 2004.

* Around 60 percent of Spain's 800,000 estate agents have closed due to the sector slowdown, an industry association has estimated.