However I think that the average investor who does strictly buy/hold, and does not do fix/flips to generate additional seed money can probably start realizing sizeable returns after about 15 years or so. 

They seeded it with what is now close to 500 dollars (Not sure if they put very little in and this is what it has matured to of what?).

The first logical leap is to find a SFR or duplex, but I would like to plant a seed and think about starting with other asset classes. 

From that perspective, you are better served doing HML and private lending from your tax deferred accounts.Also, IMHO, you should pay the taxes on the seed and not on the crop and do both from Roth accounts (tax exempt) - either the lending or holding appreciating properties.

Plant many seeds.

And not the C Corp.Is this a loophole that we can go through to avoid the corporate C Corp. taxing thT would occur if we would sell the farm today, or move to a Corp and sell after 5 years.How do we go about selling the land that is still seeded to my brother and I and was never seeded to the c Corp?

Have the lawyer on speed dial and make sure you get rid of bad seeds and make sure you keep the good tenants happy.Me personally, I won't look at a building w/out separate utilities.

My seed money to start buying flips/ rentals is tied up in a piece of bare land zoned farm/forest without a dwelling on it.

Never ever SPEND you seed money (cash). 

Flipping.Flip your cash through a property, take only the profits ou...and reinvest the seed money into the nest one.