Then, the DF Act was amended later reflecting exemptions for individuals to 3.

I would recommend amending your contracts to reflect "Turnkey" and add language that final bid amount will be amount paid, any and all added charges or change orders will need to be approved and in writing. 

A few times the title company would require me to execute an amendment changing it from a cash contract to a financed contract.  

(Amended 1/93) Article 4 - REALTORS® shall not acquire an interest in or buy or present offers from themselves, any member of their immediate families, their firms or any member thereof, or any entities in which they have any ownership interest, any real property without making their true position known to the owner or the owner’s agent or broker.

When purchasing smaller tenant occupied properties where the tenants will be remaining post-purchase, it is wise to get an estoppel certificate executed by the tenants so you, as purchaser, have some confidence that everything the seller told you regarding rents, deposits, amendments, exhibits, etc. are true and correct.

Low-income rental housing for which a depreciation deduction for rehabilitation expenses was allowed.Low-income rental housing held for occupancy by families or individuals eligible to receive subsidies under section 8 of the United States Housing Act of 1937, as amended, or under provisions of state or local laws that authorize similar subsidies for low-income families.

Except as otherwise provided in subsection (1) and as set forth below, the lien is effective from and shall relate back to the recording of the original declaration of condominium, or, in the case of lien on a parcel located in a phase condominium, the last to occur of the recording of the original declaration or amendment thereto creating the parcel.

Many of them come with a provision that a certain percentage of votes (often 75%) can amend the restrictions.  

Today is Nov 10th, and he still did not send me the payment and has not responded.In July, when it was time to renew the lease, he also messed up on the renewal dates on the contract and was reluctant to get it amended with the tenant.

That said, I am imagining if I had my license, I would have the freedom of placing my own offers at free will, amending those offers, and representing myself in the deal if it comes to that end.