I would shoot him a text and follow up with a letter through the mail to be 100% sure if I was concerned.

I also received a letter from the county saying that my property is in violation of several health and safety codes. 

Provided you are sticking to the letter and spirity of your rental agreement, you have to set boundaries People that get indignant over you setting boundaries are not worth worried about. 

This would mean you wouldn't have anything out of pocket.They could surprise you and offer to do all owner financing or do it for a few years with a balloon payment.I made an 3 offers on a house and to my surprise the owner gave us all owner financing with a small downpayment and zero percent interest. 

Send written letters, nice stationary, handwritten envelope, explaining why you selected his property and what your vision is for it.

Since you're a citizen but you live and work abroad you'd still qualify mostly for second homes occupancy or investor non owner occupancy (primary is hard to claim if your job requires you to be physically next to the office as an example so an underwriter isnt going to readily believe you unless you can get HR to write you a letter to state you're remotely capable of earning this income/job duties anywhere).Hopefully that helps let me know if you have further questions into mortgage planning.

Here is what I would do:I would still close on the property but send a letter to the sellers broker and the seller along the lines of below (note I would have an attorney write it and send it):It has been brought to our attention there was a $15,000 insurance claim on the property.

You haven't provided enough information on that to allow specific advice.If you purchased the property in 2020 you should still be at a good interest rate (assuming a 5 year balloon ARM).

Quote from @Tekoa Glover: I want to know if I am entitled to a denial letter if I am denied a DSCR loan.

Then I mail a very simple handwritten letter and usually get north of a 30% response rate.