Use the remaining cash to purchase a passive investment 1031 compatible vehicle like a TIC or NNN lease and pay tax on the mortgage buy down. 

Then we setup other investment and savings vehicles like Roth IRAs and an HSA.  30% of our take home pay was being set aside.Then we read the @Scott Trench book Set For Life and a similar article he wrote (The Simple "Secret") about capital preservation, and it blew our minds. 

Which vehicle would be best to run my Real Estate investments within: LLC, Corp, sole pro ?

@Blake ChapmanMy personal favorite vehicle for leveraging a property is a Home Equity Line of Credit.

He would like to continue to pull the appreciated equity out and roll it into a new vehicle.

My main interest in this forum as I slowly transition from cubicle dweller to independent investor is to build up my network and contacts and perhaps eventually find the next opportunity.Other than RE I'm a computer nerd for my day job, other interests include building electric vehicles, electric vehicle advocacy, bicycling, outdoorsy stuff, and vintage land rovers.  

Earlier his year I never though I would be entering the world of investment properties. In April I bought a new GMC Sierra and then a month later I inherited an older sable with low miles on it. I have begun drive the...

Tenants will pay extra to have a garage for their vehicles or their storage needs.

One thing my accountant does is deduct for gas/mileage on my work vehicle

A recent exception I ran into- tenants who have a 3-bedroom apartment, with the apartment allotting for two vehicles.