Professional ethics is based on accepted conduct and practices established within an industry or profession to ensure the public as well as others in dealing in that area are treated morally, respectfully, fairly and equitably, in carrying out professional activities. 

Keep proper records.

If you do your homework, research, and preparation properly, in general, what percentage of the time do you a.

It is our job to analyze the market and take advantage of the best opportunities that it presents......if you lock yourself into one type of investment (buy and hold, lets say), then you do yourself a disservice by also locking yourself into a specific geographic region that doesn't necessarily present the proper conditions for that type of investment to thrive.

We never charge our tenants for painting to turn a unit ... but in this case I had to use a heavy duty sealant primer to ensure the stains and odors don't come right back up. 

If you do your homework, research, and preparation properly, in general, what percentage of the time do you a.

After coming to an agreement with the LOI, what specific terms should I include in the seller financing to ensure I am protected properly?

Some States require that to be professionally mitigated and if not, You can be held liable for years after you sell it if not done properly- Plus you will have to disclose you had mold and how you mitigated it.My humble opinion- Walk away with the spread you are currently getting.

Let them know you are happy to work with them as much as you can, but only they can guarantee that their credit will remain intact by ensuring you have no reason to send them to collections and they cause no damages that their deposit doesn't cover.

IT might have been better to dig deep and pay the vendor now and save your headache and renter frustration and relax over the next decade, with proper maintenance of course.