Random fact: Play-Doh was created as a way to clean coal soot and dust from wall paper, back when there were coal fired furnaces.  

I am getting leads however my numbers are off when generating offers.

In fact you get to use that deferred tax to generate income for yourself. 

There's a bunch of random patching around both units5.

There's also a question of whether it makes sense for my business to lease 51% of the building (I really only need a small office for that business and the building is about 6400 square feet).Would it be better for me to just negotiate a master lease with option so I will have 3 years to generate the 20% down payment for a conventional loan?

SEO is hands down the best method for lead generation no argument.

The only one that had any money management skills were my grandparents, who were first generation Italian Americans and knew how to squeeze a penny till it bled.

(Random numbers just for an illustration.)Unfortunately, the rate difference can sometimes work against you: you may end up paying more taxes on the depreciation recapture than what you saved from the depreciation itself.

But we also thought about staying at the current house and using the money to buy rental properties and generate more income before we get a better house for ourselves.

You'll need to generate a lot of leads to get one deal.