Obviously the numbers and location would determine which is the best option for me but these would be my preferred methods. 

If they don't pay willingly, what are my options? 

There are plenty of resources online including anderson youtube channel, few other sources are :https://wcginc.com/kb/ and https://wcginc.com/fee-structu... -- They have fixed fee structure to compare with anderson advisors without any blatant selling tactics https://www.kbkg.com/" class="redactor-autoparser-object">https://www.kbkg.com/https://go.empiretaxusa.com/61...If you attend any tax-wise or other 3 day events with anderson which costs $197 + travel expenses you will get enough knowledge on how they operate and you should be able to understand what LLC structure is beneficial, also they have a large collection of online videos with plentiful of information on youtube and tax tuesday webinars.

Great to meet you.We source from four primary suppliers: Lowe's, Home Depot, Floor & Decor, and Amazon.

Outside of raising money from others or seller financing, I am looking to see if there are private or other lending options that could cover 10-20% of a downpayment on these loans with a shorter loan term of say 5 years.

If this property is hard to rent, or is functionally obsolescent (only 1 bathroom, no yard, etc), or has deferred maintenance that will be costly, or is in a location that is not appealing to Tenants, then maybe a sale would be a good option in favor of a property that has better Tenant appeal, which will likely increase rent and avoid long vacancies in between Tenants.An option to consider....

Quote from @Jimmy Chao: I am weighing some options to help my younger brother buying his first primary with a fixer.

@Cole Starin sometimes it makes sense to sell the WORST property in your portfolio.Another option is why do a LOC on the duplex, when you could just do a $100k cashout refi to pay off all your debt AND keep the property?

However, seeing as though I have already sourced the deal myself, would it still be in my best interest to use a realtor for this transaction if it works out? 

It’s the BRRRR with the lease option rather than just rent.