My landlord has put our building on the market. I would like to buy it but not for what he's asking. Can you please tell me how to find the market value of this property so I can make a realistic bid on the property? Thank you very much.

For income producing property, you use the income approach.

Take a look at http://www.loanuniverse.com/purchase-opportunity.html

Just don't use a 10% cap rate like I told that visitor. Use something around 7%.