What is the cash-flow on your fourplex, and how much would it increase if you eliminate the mortgage payment?

Third party property management will eliminate a lot of the weekly tasks. 

The place to start is by eliminating markets with high property taxes and laws that are hostile towards landlords.

It helps eliminate me sending my deals I worked on locking up to other wholesalers who are just gonna add $ onto my asking price and blast their email list of cash buyers. 

As mentioned by others, if you can find a loan interest rate that is better and you eliminate the PMI insurance, a good thing to see if you can do is shorten the length of the loan if you end up paying the same amount you are paying now, you win with a shorter pay off time, less interest paid and equity gets built faster.

Make sure you always make money on the buy and sharpen your negotiation skills, this will eliminate you trying to time the market. 

So you’ve just eliminated 80-90% of the buyers, owner occupants that need to move in within 60 days.

If the tenant is threating damage to the house in response to an eviction, then I would have seller contact police, additionally, the law provides for landlords to access their property with proper notice and refusal by the tenant is a violation of the law, the seler could have the police come to witness the access and eliminate any danger to the seller.

You probably eliminate 90-95% of the buyers when you need 25% down. 

I am connecting these dots in my mind, so maybe that's not the cement siding being eliminated.