If you do own free and clear and are interested in seller financing, which seems to be what they are asking for, figure out a down payment requirement that would ease your mind if you have to take the house back from non-payment, high enough to cover any damages they've caused in the meantime.  

A property in a crime ridden neighborhood with low quality tenants may have more problems as far as evictions, tenant damage, theft, tenants arguing with each other, etc...

I specialize in these areas and see the damage done to out-of-state investors firsthand. 

Have a possible wholesale deal and need help with evaluating repairs and what to offer seller.House was built in 20024 Beds, 3 Baths 2,300 sq feet6100 sq ft lotComps around $350k Outdated with wood floors, gold fixtures, and yellow walls but no major damage. 

It did flood and did minor damage to it but we kept it and I told them prior they are responsible for anything that happens to it so we let it be. 

Don't confuse clean with damage.

If not, what is the damage of rejecting their request?

Once this happens buyers look at your property as damaged goods and any offers that come in will be discounted.

Window blinds would be typically damaged from tenants trying to peep out to see who is outside at every possible noise.

Demo all the drywall out, remediate mold, complete reshingle of roof, replace all windows, replace all outside soffit/fascia/dormers, replace all siding, repipe whole house, rewire whole house, redo all mechanicals such as hvac, redo all interior and exterior doors, paint interior and exterior, replace any framing or insulation damaged by mold/water leaks, replace all gutters, minor landscaping, minor outside repair of concrete wall, install all new cabinets, install all new countertops, replace everything in 6 kitchens, replace everything in 6 bathrooms, install handrails,  install significant flooring and minor subfloor repairs, and install all trim in house.Project will cost around 150,000$.What would be fair for this?