Is it in the MLS? I'd be happy to get a ball park value for you.
Go tohttp:// http://www.mcohio.org if it is within Montgomery County, look at the property tax records. It lists the owner's name.
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The value (what you should pay for it) of investment real estate must be determined based on the financial performance of the property - how much cashflow does it generate. A property is a business and must be looked at as such. There are a lot of things that go into evaluating a property; location, economic factors of the area, past performance, potential performance, etc. A great book (maybe the best I've seen) is Ken McElroy's ABCs of Real Estate Investing. He lays it out, bit by bit, in detail how to properly evaluate a property you're looking at as an investment. Ken is an investor and property manager himself and his advice and help are extremely solid.
Also, and most importantly, do not work with a realtor who works in primary residences only (helping people buy their home). They have no idea what makes a good investment property. You need to find an agent who is an investor, was an investor, or understands what makes good investment real estate. An inexperienced agent will have you buying properties without the proper evaluations, costing you tons of money.
Finally, do not get emotionally involved in the property(s) you're looking at. Yes there may be characteristics of the property that make you absolutely "fall in love" with it. The only characteristic you need to concern yourself with is CASHFLOW! Period. Look at tons (at least 100) of properties before making offers as well.
I hope this helped. Good luck.
However, the tax office is sometimes wrong - they don't necessarily line up with market conditions. You may wish to contact a local REALTOR and have them pull "Comps" or Comparable Properties to determine Market Value.