Addition once prepped: 1000 X 200 p/ sq : $200k (all depending on architecture of the home: as a more modern design with a lot of glass and steel will be much more expensive : or more expensive materials would be more expensive also. 

I am thinking to purchase a property in the range of $500k.I haven’t met with a mortgage broker yet to confirm whether I would be able to qualify on my own or would need a partner for the purchase.

Treatment and repairs are required if inspection confirms termites present.Structural - No settling or structural issues present.For this reason, it can be very difficult to buy a fixer-upper or a foreclosure with an FHA loan. 

This forum is designed more for residential types of lending.

Science - real science - depends on theories and experiments that can corroborate and confirm a large body of evidence to create "facts", generally replicable.

I've owned the house for few years and have spent a lot of time trying to design an addition to add value to the property, but the current floor plan is really not conducive to realizing a return on that investment (tiny living room, low ceiling basement, poorly placed basement stairs, etc.). 

Might want to see if you can get confirmation from the seller on that if you haven't already.2.

Either tell the former tenant that what you said was confidential and you won't confirm any information or lie and say you didn't give them a reference.

They brought the idea to a lender after I explained it to them and he confirmed that it would work the same way on a mortgage.

The estoppel certificate is a form filled out by the tenant and then confirmed by the Landlord.