I have given extensions but made it very clear that after the extension they will be removed in accordance with the law regardless of whether they have found a new place.

Screening tenants, collecting rent, deciding on renovations and repairs, etc usually fall into that category.

I know SC extensively  and OH a little bit.

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.

The rent we are collecting helps us comfortably live here in the house we are renting. 

Now as Bruce said normally the mortgage company collects money for taxes with the mortgage payment.

The office manager requested I file an extension because I cannot see a CPA until after tax season. 

I have (for our system) water and antifreeze temperature logger data collected every hour for the past several years.

However, I will also be collecting rent on my current home and half of the duplex duplex which I own and am purchasing via residential loans in my name.

Even though in some places one organization collects taxes for multiple taxing jurisdictions....for example the county may collect for, the county, the city, the school district, the hospital district, the community college district, the water supply, the noxious weed control district, etc, the individual entities may have lists too they would give you.