The replacement property must be of "equal or lesser value" than the original property.
In general, equal or lesser value means:
100% or less of the market value of the original property if a replacement property were purchased or newly constructed before the sale of the original property, or
105% or less of the market value of the original property if a replacement property were purchased or newly constructed within the first year after the sale of the original property, or
110% or less of the market value of the original property if a replacement property were purchased or newly constructed within the second year after the sale of the original property.
Note: When making the ?equal or lesser value? test, it is important to understand that the market value of a property is not necessarily the same as the sale or purchase price.