He has had it rented out on air B&B for the past 4 months with out a lapse in bookings.

New buildings may requires those improvements, and rehabbing may require installation but otherwise older buildings can remain as is.

How much did you invest into the house improvement-wise?

These types of activities can release asbestos fibers into the air.

I'm an Air Force vet and aspiring financial planner myself, currently taking the education course for the CFP right now.  

You might get the rating improved, maybe even to the point that flood insurance is not required.- Pay to raise the house up on pilings. 

A lot of businesses are having a hard time these days and over the past year and doesn't seem like that is likely to improve so best to look down the road and plan and see if they are still good investments.  

Price has to be right to allow for the updating, and then 203K helps you buy the house and fund the improvements. 

@Phat Dao, most improvements you hire a contractor for LOSE money and a garage is probably one of the worst tbh.

Long term rented until 2019. 2019 renovated 20k. 2020 Short term rented Air BnB.