From the notaries' and tax department's databases, using a repeat sales method, one can reconstitute in Paris a yearly home price index back to 1840, and an index by decade back to 1750. Farther back in the past, home price variations can be roughly reconstituted back to the 13th century. This home price index can then be put into its social and political context (revolutions, wars), compared to home prices in the rest of France and in other countries, to macroeconomic aggregates (consumer's price index, GDP per household, disposable income per household) and to financial aggregates ( stock, bond and gold prices, foreign exchange rates). Some long term regularities appear, of which some can be projected into the future.