How to estimate the ARV in multifamily

[Wilson Lee]

I am buying a 14 unit multifamily property that has a lot of deferred maintenance. The rehab is extensive and I need to know when we refinance later that the value in the building will be high enough. How do I go about estimating the ARV of an apartment building?

Also, Where can I find data to help me make a determination?. What is a good online source for market data reports for multifamily sales in a given market area? Some of the information I am looking for is as follows:

Sales price,

Price per unit

Price per Sqft

Sales cap rate.