Work on creating a buyers list so you can avoid this problem.  

I’m seeking advice on how to effectively create an offerand structure the deal.

There are great services out there that assist in marketing your property, creating online applications and screening your tenants for you. 

In those cases or other specified large rent increases that cause displacement, landlords would have to pay relocation benefits, with increased benefits for the disabled, seniors and those living with minors.The measure would also create a nine-member rent stabilization board to determine annual adjustments, hear petitions for individual rent increases and pursue remedies in court.

I am in the process of creating an LLC or LLP for my company that will start buying tax lien certificates.

Several people I've spoken with suggest creating a relationship with your alderman or knowing the right lawyers who specialize in zoning that can help expedite the process.You also want to consider if it makes sense economically. 

However, you should have that in writing and each you and your father would report a percentage of the income/expenses on each of your return.If you and your father created a partnership agreement - you may be required to file form 1065 and report a form k-1 to each partner.

Our goal is to create income through multi family rentals. 

My advice to you is to create an LLC with the relative as a capital partner in the LLC.

I create a landing page on my website, then blast out a summary email to my buyers list.