Do I need to get a commercial real estate agent or do I need an attorney to look over the transaction?   

@Kunal Lakhwani I agree with everything @Owen Rosen is stating and would add most policies will have a clause stating if it has been vacant for more than 60 days, then Theft can be excluded.At the end of the day, only an agent who can review your current policy can advise on how your policy will respond.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

I can get you in contact with a agent who can provide an umbrella policy.

A warranty deed is a promise or guarantee (or both) in a real estate transaction by a seller, to a buyer.

I'm a real estate agent, investor and developer in central Houston and I'm happy to answer questions that you may have as you get scale up!

I'm sure you and your agent have done your due diligence on the STR regulations in your market, but I would encourage you to analyze the deal as a long term rental and verify the numbers make sense.

I would work with an investor-friendly agent who focuses on cold-outreach methods like cold-calling, cold-texting, etc to bring you off-market deals.

Personally, I would advocate for opening an LLC (I use NW Registered Agent) and then open a business checking account (I like Relay) so that your funds are separate. 

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?