Normally in purchase financing, mortgage lenders have a rule that their loan be based upon 1) the appraised value of the property, or 2) the purchase price, whichever is less. But what if the property has appreciated considerably since the purchase price was agreed to years ago, as may be the case in pre-sale condominium and pre-construction purchase agreements and even rent-to-own transactions? The question then becomes, can I get a pre-sale condo mortgage based on the higher market value? Can I use price appreciation as my mortgage down payment?