I guess the way I would do that would be to create a custom Security for each real estate investment. Following your example, in your brokerage account you would purchase 100,000 shares of that security at $1 per share. When you get the distribution, sell 8,000 shares for $1 per share (return of capital) and add a second transaction which would be a $2K capital gains distribution.
I don't think I would create a separate account for each real estate investment, I don't see how that would be useful.