So it's all about money and long term security (amongst many other things of course)That would make me consider 2 things first off:  Is the state tax (property tax, income tax, sales tax) and landlord friendly?

Considering that they should be out and are basically pulling a fast one on you (POA's should be negotiated during the initial contract signing, not after closing), I would charge the very upper end of market rent and demand a large security deposit.

I have a general question about choosing a business name for an investing company (in my case it will be fix&flip business),I see two different strategies:1- Personal brand, which is connected with your personality and name, for example "Daria Real Estate LLC", 2- General business name with no focusing on the owner, such as "Freedom Real Estate LLC" or similar, where you basically choose the word you like and add "real estate" at the end.The goal is to advertise the business on social media and connect with like-minded people to share the experience.

I know this is not necessarily big in my area but check with a lawyer about an estoppal agreement which is essentially a document that allows the tenant to verify lease terms that way if after you purchase it they cant come to you and say their rent was cheaper or their security deposit was much more than what the seller told you.

Having a plan to secure profitable customers.

In fact, the last three rentals of mine that came up for renewal in the last year had new tenants apply, background checks completed, and first months rent + security deposit paid sight unseen.

This can be a bone of contention when it comes down to it as unfortunately, in your circumstance, I would argue as the listing agent for my seller to keep all of the EM because you did not perform to the TPF addendum as you were not able to secure financing because of failure to successfully obtain Buyer Approval.

Security for you, and he can't just sell it to someone else down the road.

It is even more important in the age of social media where one angry customer can destroy your business. 

I am looking to secure a line of credit on my investment property.