Generally, a BPO is considered a snapshot of the property's value based on the market conditions and information available when it is prepared. The values contained in BPOs may remain current for 30 to 120 days, though this could be even shorter in some instances.
The party requesting the BPO, such as a lender or a financial institution, will often specify the acceptable time frame for the BPO to ensure it reflects the most current market conditions.