Properties can also be mortgaged, although all developments on a monopoly must be sold before any property of that color can be mortgaged or traded. The player receives half the purchase price from the bank for each mortgaged property. This must be repaid with 10% interest to clear the mortgage. Houses and hotels can be sold back to the bank for half their purchase price. Players cannot collect rent on mortgaged properties and may not give improved property away to others; however, trading mortgaged properties is allowed. The player receiving the mortgaged property must immediately pay the bank the mortgage price plus 10% or pay just the 10% amount and keep the property mortgaged; if the player chooses the latter, they must pay the 10% again when they pay off the mortgage.