So there could be benefits from starting a new lease for that reason.

As I wrote in another reply too - one more benefit for me is that in a way it's "forced savings" - I have to find a way to pay the bill...

What are the limitations and benefits?

Of course to maximize your tax benefit it needs to be sustainable over time. 

I’ve never managed roommates or lived with roommates but I know it will benefit me so if  the triplex doesn’t work out I wouldn’t mind having roommates.

.—(1) Whenever money is deposited or advanced by a tenant on a rental agreement as security for performance of the rental agreement or as advance rent for other than the next immediate rental period, the landlord or the landlord’s agent shall either:(a) Hold the total amount of such money in a separate non-interest-bearing account in a Florida banking institution for the benefit of the tenant or tenants.

I wouldn't suggest you buy a single-family home to live in because the additional cost outweighs the benefits.

I can find numerous other similar homes for investors.

The growth in San Antonio is moving north and the builder incentives will benefit a new investor like yourself.

Realistically, there should be no benefit, and there are probably some disadvantages, of doing what you propose.