Estimating multi-fam property value?

[Maurice D.]

how do you estimate the value (offer) of a multi-fam (<= 4 units) unit when there are no comps? 

when I look at a property, for example that sold in 2015 for 175K, and add yearly appreciation for the area I come up way below the current ask (330k, neary 50%!) 

At 10% a year (for example) I get 

2015  192k

2016  211k

2017  232k

2018  256k

330K is the seller on crack?

- do you go by $/sq ft of similar sized properties?  

- use appreciation and extrapolate current price?

- combine all of the above ?