How do I find property for a new buyer & profit as a non-broker??

[David Jones]

After purchasing a self storage property for $500,000, I was approached from another buyer who offered $1M. Seems like a no-brainer, but the guy wanted to level my facility just to put RV storage up. I though there must be a way to find this guy another plot of land to put RV/boat storage and profit on it without giving up my storage facility. 

How do I make a transaction where I can buy a piece of land and immediately sell it to someone without being a broker, or taking unnecessary risk?