What is your current Income, Assets, Liability, Amount Capital Reserves ?...

Also, I have very little capital at the moment but I anticipate being able to stash some cash away in the time that I'm researching (I have no debt other than the two houses I own; one is rented and I plan to rent the other when I move out of the US).

The reason I asked for seller-financing is bc I have limited capital.

Unfortunately, we figured out this enormous scalability after we liquidated our capital for development of what is now phase 1 (80 acres) where we thought the sole cultivation site on this property would be. 

Who/where should I reach too for capital.

Do you need a lot of capital to start investing ( here in Denver the market is extremely competitive ) ?

In most cases this requires a capital expenditure that should be factored in a Comparison analysis. 

Being new to this I have a few questions. 1- Do I need to pay capital gains on this money if I don’t use it all as a down payment ?

I was told the seller was installing a new $15K HVAC system (due diligence shows he hasn't quite spent that much on repairs and capital expenses in the past 5 years, despite this being on the market for 2 years).

You could lose this thing as Jay mentions... this was far more common coming out of the deep dark recession.. but now a days builders don't need to do this and if they need to do this means they are either long on jobs or short on capital.