Your key considerations include loan approval, property management, market research, legal ownership, tax implications, and an emergency fund.

I manage 100+ properties, mostly Airbnb and MTR.STR and MTR demand is very strong in Roseville, driven by demand but also a lack of supply...

Most larger property managers require it in their leases nowadays.

Am I correct in thinking that you officially have Rental Property when you sign up with a property manager?

The larger the portfolio the larger reserves you'll need. 

So, in this way I manage the portfolio has a business instead of managing each property as its own separate business.

If you are looking to continue to scale your portfolio it may be worth looking into a DSCR. 

At the guidance of the comments here, I have talked with the Condo Manager and Tenant.  

To start, complete your profile, set investment goals, use educational resources, network, analyze deals, seek mentorship, and focus on market research, financing options, investment strategies, and property management.

I manage Short and long term rentals.