A properly installed radon mitigation system with post‑test results under typical safety thresholds doesn’t devalue a property; if anything, it reduces a future buyer’s objection by turning a health risk into a solved, documented feature.

That is poor asset protection, whats his email?

From my perspective the property is poorly managed and no major repair or renovations have been done since 2003.

Between the bad, poorly structured English grammar and the typos in the "term sheet" and the ridiculously unrealistic offer, there is 0% chance that this isnt a scam or fraud.

This is because historically most of these markets have poor long term rent growth and poor long term appreciation.  

But I am an RE investor and I have a desire to make offers, so I make offers.My belief is most RE investors who buy LTR off the mls in San Diego will have poor returns in the near term.  

Most red flags appear through inconsistent stories, poor communication, urgency, or hesitation to provide documents. 

An almost universal theme reported by those who had pizz-poor results and experience with an agent is they, the uninformed NON-professional property owner, said all the things they hoped and wished for, thought and expected, and they agent simply regurgitated a "Yeah, sure, 100%, we can make all that happen". 

( difficulty reselling the unit, and it has a small percentage risk on your health)I would like to know if the value of the condo will decrease overtime and your thoughts about the situation.

His property was a poor investment, but it was his job to convince a buyer (sucker?)