@Max Bellino For smaller properties like your 2–4 unit multifamily buildings, an online cost segregation study is a quicker and more cost-effective option, providing sufficient accuracy for straightforward properties.

@Micah Huffman unless you are going to commit to learning some basics about being a landlord AND are willing to commit at least 2-4 hours each month managing a Property Management Company - it's probably best you sell.Otherwise, it's highly likely you could lose more due to bad tenants and management.

Say you get to keep 6-7k after tax.I like Option A all day long. 

I would have advised you against an LLC, most likely, contingent on your attorney's legal protection concerns.This is assuming that by "we" you meant your spouse.

I messed around with Landian and it seemed like a joke.

If you are borrowing $150k, rates will not likely drop enough for you to justify a refinance due to lower rates.

Ebooks, podcasts like @Bonnie Low suggested and start running numbers on every deal you see until you know how it all works.

With the exception of building a trailer on the property (these are hard to finance), this sounds like a good plan AND if you are using it for your business AND your business pays more than 50% of the rent (if you have more than 1 tenant), then this is a more financeable property in the eyes of banks and credit unions as it would be consider a commercial "owner-occupied" property. 

Things like:🚫 “I need seller financing.

20 townhomes sounds like it would be sales, but I don't like to assume.