It doesn't look like you would be getting much from the sec121 exclusion.Not sure how selling this property would get your more funds into your Roth IRA, unless it just because it frees up money to make the contribution..If you need funds to build up a reserve / rain day fund / etc., this might be a way to go... 

My preference would be to allow the tenants to finish the current lease as they are currently building their own house and have been great, low maintenance tenants thus far.

If you go up to the "Build Your Team" part of the banner and then go to Events & Meetups, you'll be able to see if someone in/near your area has a meetup organized! 

Post build the value should be $1.2m or more.    

Go to BUILD YOUR TEAM at the top of your screen and you can search for other MEMBERS or LOCAL MEETUPS.

Duplexes, triplexes, and larger apartment buildings are popular choices, especially in areas with strong rental demand.

He's here this weekend for actually two days: Friday p.m. from 3 to 6 he'll be talking about using QuickBooks in your REI business and Saturday from 9am to 5pm he'll be talking about building your entity structures for tax advantage, asset protection and estate planning, including how to pay your minor children without also having to pay SUTA, FUTA, FICA, etc. for them.I can't do this justice not being a legal / financial professional, but from what I remember, you DO NOT WANT to pay them out of an S-Corp or an LLC.

Purchase a multi unit building, managed by a management company. 

However, I would appreciate further clarification on what you mean by having a Plan B, C, and D.In my experience playing the BRRRR game on a smaller scale, typically with homes valued around $200,000, I have found that it can be challenging to generate significant monthly income, Instead, the focus is often on building a portfolio without having to make substantial out-of-pocket investments, which is indeed advantageous.

Equity in a deal is important as well, so they will look at that across your portfolio potentially if you are using your other buildings to show income or use them as collateral.