We build an aggregate model with different size houses and liquid assets. Typical households are born, are subject to idiosyncratic earnings risk, and save for both life-cycle reasons and housing reasons. Typically, a subset of these households, after accumulating some assets, make a down payment and buy a small starter's house or flat. As time passes, some households upgrade to a larger and nicer house. Households with houses may also eventually downgrade to a flat or even to no house and flat owners may sell. Our specification attempts to replicate some important features of modern aggregate economies: The distribution of earnings and of housing and non-housing wealth as well as some macroeconomic aggregates, including features of the mortgage issuing sector.