My question to the BP community is, besides leasing out the land to a farmer or growing crops myself,  what other ag-related business can I operate that would generate income?

If you or your advisor plans it right, you can build a portfolio that generates enough dividends/interest to cover your Margin LOC interest rate.

Great combo for fast wealth generation.

Just a final point, and it's market based, but I would stay away from condos as an investment property unless you are going to keep it in the family for generations and don't care about an exit strategy someday. 

The way the income or loss generated from the property will be treated for income tax purposes depends on what you do for full-time work, how much money you make and other factors.

Teaser: The secret part of the website lead generation equation.

Provided a suitable down-size from our old home, with the ability to generate cash flow after we move out in a few years.

ROBS is designed to generate tax-sheltered income that you canNOT access for personal needs. 

My main goal is to build my real estate portfolio to generate enough passive income that I can quit my 9-5 and dedicate more time to RE investing.

They will not generate respectable revenue numbers for 99% of their listings.