Yeah, we closed Dallas, and other locations years ago. Nothing to do with "success" or anything, simply business decisions. Back in the 1990's we had around 50 locations because it made sense to have a few people in a room to share the costs of the (then expensive) T-1 lines for routing to the Exchanges.
When these expensive leases came due, and technology got cheap (everyone wired at home with cable modem for nearly nothing) - we simply asked the traders if they wanted to share a location, split rent etc. We didn't want to be in the Real Estate business. A few chose to stay open for few years, some still are, most are closed.
This filtered into our more collective and inclusive remote set ups. Every trader is online with their manager, mentor, (me?) during the trading hours. We do our Morning call pre market, Tuesday Talk twice a month etc.
I like Dallas and Houston, go back often to meet with people. On a side note, Texas was tough because of (in part) the so called "SOeS bandits" - left a bad taste with the regulators.
I think we have about 8-10 locations. A few affiliates in the planning stages. Hope to be back to Texas again at some point.
Don