I don't know if it is required to have a gate, but I would highly recommend it. It is easy for kids and small pets to fall into pools, and you don't want that to happen. Besides it being a tragedy, you would be liable as the property owner.
Also not sure why you would want to find an investor. They are the ones buying up the properties to rent or flip. Typically investor will not play the role as a lender. I have several great lenders that can help if you'd like.... more