I heard of a firm called spectrum trading in SF that is a licensee of Andover. They have some good experienced traders, mostly from ETG and Generic in SF, but I heard some very negative things about the Branch Manager. They are so negative that I will not repeat them here at the risk they are incorrect, but I would check the OM, a guy named Jeff, out carefully.
I don't know if this is the same office you are referring to or if Andover is opening another office in SF or taking over this one. I also heard that Andover is getting out of backing traders. They will only give a deal like Bright where the trader takes all the risk (and gets all the reward or close to it) and pays less than a penny a share. The trader must put up around 50k to get started.