The lower unit is small and gets rented 6-9 months at a time to traveling school people like occupational therapists.

You have a natural advantage with other baseball players and providing them leases that fit their needs.Knowing a couple of others who have played minor league ball, your real estate strategy is going to be tricky because you will be very busy with baseball and it's travel. 

Have you read The Slight Edge by Jeff Olson and Atomic Habits by James Clear?

Their strategy focused on targeting traveling nurses, a niche market with reliable demand.As for repeating the process in the same city, it's doable but requires careful planning.

Many of also argued that forcing out many STR's will impact our tourism revenues, which we're very dependent on, as many travelers won't come here if they have to stay in a hotel.

Quote from @JD Martin: Quote from @John Underwood: Quote from @Collin Hays: Quote from @John Underwood: Require travel insurance that you can make a claim on? 

I am looking to invest in Temecula,CA  with the purpose of renting bedrooms to traveling nurses.  

If this is your first venture, your presence at the property will be very important, there is a learning curve, factor in your travel time and other commitments.

We make thousands extra each year on pet fees and have never had any damage.Most of our guests travel with their pets.

That is with travel time.