http://www.ecb.int/pub/pdf/other/euhousingmarketsen.pdf

http://www.tradingeconomics.com/

http://www.wsjprimerate.us/libor/libor_rates_history-chart-graph.htm

http://www.investopedia.com/articles/mortages-real-estate/11/factors-affecting-real-estate-market.asp#axzz1XB63hJtH

Demographics 

Interest Rates

he Economy
Another key factor that affects the value of real estate is the overall health of the economy. This is generally measured by economic indicators such as the GDP, employment data, manufacturing activity, the prices of goods, etc. Broadly speaking, when the economy is sluggish, so is real estate.

Government Policies/Subsidies

UK

http://www.uk-houseprices.co.uk/housing_market/factors_affecting_prices.html

http://www.mortgageguideuk.co.uk/blog/uk-housing-market/interest-rate-cycle-in-uk/

Economic Growth / Real income.
Rising incomes enable people to spend more on buying a house. Traditionally, there was a mortgage ratio of 3 times your salary