Be careful buying foreclosure for business use

Check zoning laws; include key contingencies in contract

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Q: With all the foreclosures in my area, I am pondering the idea of buying a small house and converting it for business use. I have excellent credit, so I know I can do this. However, I am not sure where to start. How does one find homes that are in foreclosure? Is a Realtor needed for this? I am also not sure where to find laws/regulations on opening a small business in a residential area?