Seems like an error, you should get in touch with your broker.

Its counted as investment interest in the US, assuming you hold the position for longer than 45 days. If you held it for shorter than 45 days the cost gets added to your purchase cost. In the end both results are the same (increasing your cost base), just the item on your taxes changes.

Edit: for tax purposes you made a loss (option 2).

REITs are already down a lot as they are traded freely. Real estate funds often base their NAV on valuations from valuators which lag the market and as a result their NAVs are likely materially overstated, especially when compared to the implied values of listed REITs.

He is describing a darkpool, not a market maker. Specifically a broker-dealer dark pool. A market maker is simply a company registered at an exchange (usually investment banks, but not always) that acts as a middleman, both buying and selling shares on the exchange so that there is enough liquidity to complete transactions. They make money by buying shares for P-1 and selling for P+1, so to say. When you place a buy order you pay slightly more than you would get if you sold that same share. Market makers earn their living on the difference between those two.

Exactly, the explanation in the image is as clear as it gets...