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What is street-side booking?
The way I would use it is, every trade done by a broker has a client side and a street side.  The client side is for their brokerage account, and the street side is whoever they traded with Say, John Doe calls me at Charles Schwab and wants to buy 100 IBM.  I look at the market and decide that the best execution is on Arca.  I trade on Arca for the client.  Then, I book a client side trade into his account, and a street side trade against Arca.  If I myself was a dealer in IBM and executed against my inventory, the street side would basically be internal, booking a trade against my account.