I received the tenant's security deposit at closing.

He has reiterated to me that he has "not received the refund of [his] security deposit."

The basic acts of screening tenants, signing leases, paying the bills and receiving the rents are administrative in nature, and if in a modest amount would not likely be viewed as providing services. 

I had received a quote about a Comelit system but I can't find any information about them.

Here are the laws in regards to this stuff.4735.01 [Effective Until 3/20/2019] Real estate broker definitions.As used in this chapter:(A) "Real estate broker" includes any person, partnership, association, limited liability company, limited liability partnership, or corporation, foreign or domestic, who for another, whether pursuant to a power of attorney or otherwise, and who for a fee, commission, or other valuable consideration, or with the intention, or in the expectation, or upon the promise of receiving or collecting a fee, commission, or other valuable consideration does any of the following:(1) Sells, exchanges, purchases, rents, or leases, or negotiates the sale, exchange, purchase, rental, or leasing of any real estate;(2) Offers, attempts, or agrees to negotiate the sale, exchange, purchase, rental, or leasing of any real estate;(3) Lists, or offers, attempts, or agrees to list, or auctions, or offers, attempts, or agrees to auction, any real estate;(4) Buys or offers to buy, sells or offers to sell, or otherwise deals in options on real estate;(5) Operates, manages, or rents, or offers or attempts to operate, manage, or rent, other than as custodian, caretaker, or janitor, any building or portions of buildings to the public as tenants;(6) Advertises or holds self out as engaged in the business of selling, exchanging, purchasing, renting, or leasing real estate;(7) Directs or assists in the procuring of prospects or the negotiation of any transaction, other than mortgage financing, which does or is calculated to result in the sale, exchange, leasing, or renting of any real estate;(8) Is engaged in the business of charging an advance fee or contracting for collection of a fee in connection with any contract whereby the broker undertakes primarily to promote the sale, exchange, purchase, rental, or leasing of real estate through its listing in a publication issued primarily for such purpose, or for referral of information concerning such real estate to brokers, or both, except that this division does not apply to a publisher of listings or compilations of sales of real estate by their owners;(9) Collects rental information for purposes of referring prospective tenants to rental units or locations of such units and charges the prospective tenants a fee.

That way you know what type of loan you can receive and how it impacts you on your future purchases. 

About a month ago we stopped receiving hot water in our showers.

About a month ago we stopped receiving hot water in our showers.

(I’m also looking for RE agent and contractors to work on this project….PM me)I was shopping for Home Owners insurance and have already for received few quotes from my current agent (It seems high).

If I receive a small cash flow of $600+/month, that is nice, but mainly I want to do it for tax deductions against my personal income so that I ultimately pay less in taxes and earn more throughout the year.Assuming I have a single member LLC with the property under said LLC, when I go to do my taxes - TurboTax asks me "Let's See if You're a Real Estate Professional"So of course I have a few questions:1.