My goal is to acquire as many houses as possible and become a mini bank.

. - Long term goal would be to sell down the line so would hate to have the tenants trash the hardwood. 

The goal with paying it off would be to jump the mental hurdle of owning a property free and clear, start an LLC and transfer the title into that LLC, and then to have a property that we can HELOC against in order to have the flexibility to make cash offers so that we can begin making LLC purchases more easily rather than titling in our own names.I'm certain that plenty here would advise to continue rolling the money into new properties, rather than to pay one down, since owning the house free and clear would provide about half the cash flow that we could get from down payments on two new properties, however my wife (in particular) and I both like the idea of simply owning one property outright and then using the above strategy moving forward. 

I am in the same boat where I want to move faster acquiring properties and don't want to spend months saving the money anymore.

Steve speaks to the mission/goal of what he is providing folks in his community AND about how he is trying to create a legacy for his children by immersing them in the business, having them put in sweat equity, etc.-- which is EXACTLY my why....   

There area  ton of strategies to learn about and explore, but you should figure out what your goals are.

My end goal Is to hold It for a few years and sell It through seller finance.

Exit strategy and goals may not be the same.

See pics below.My goal is have it apprise for 75k and refi LTV of 75% = 56k budget. 

The goal of the 50k is to cover TI,LC's, downtime of lost rent, attorneys fees, tenant rep broker commissions so when the space is released you are almost breakeven with the money.