If it were ME and assuming said individual is living just fine without the money...I'd keep working my job, doing the same things I always do with the rest of my life like nothing has changed AND I'd seek out the happy medium returns vs. risk. 

However, my lender said that I cannot use an FHA loan because the building is comprised of 4 individually zoned town homes, meaning they can be sold individually.

Ultimately, if you are looking at purchasing more properties I would recommend looking into the Series LLC, as you only have to publicly file the "parent" Series LLC and then you can create an unlimited number of "child" series under it - each offering the liability separation of individual LLCs when operated correctly. 

Sidewalks are a huge one especially...the city/town/village owns the sidewalk if you need to block it for some reason (you need a permit), but come time to replace it, remove snow, etc. it belongs to the property owner.

In the 16 months I’ve been in my home the value (redfin/and Zillow do grain of salt) has nearly doubled what I paid due to some expensive flips a block away.

My wife and I bought the corner 2 family of a block that we are improving. 

Some look structural .You will be doing some footer work , some block work and a lot of parging or stucco work  and concrete work , and drain tile with a sump pit .  

Solo 401k are for self employed individuals so it won’t work when she is an employee of the business

I use a separate account for each rental but still, if I need to evict a tenant I want complete ability to block partial payments.

It was two blocks from another flip we were doing.