Washington: Howrey's home office is located in the Time Warner Building on Pennsylvania Avenue (through some creative street address numbering, but I'll set that aside). This is massive, expensive space. It was featured as the home of "The Evil Law Firm" in the Pelican Brief, with Julia Roberts walking through the creepy interior atrium. Who knows how many Howrey attorneys remain in DC, but it seems that the Howrey DC space is fairly low density these days, and who knows what percent of the remainders will become Winston & Strawn attorneys. This means that either (a) the former Howrey DC home office will become entirely too low density to make sense or (b) Winston DC office might have enough space for Howrey attorneys to move in. Either way, the DC space isn't going to make much sense. All 10+ floors of it.
Houston: About five years ago, Howrey forced its Houston office to leave its long-time home in the Galleria area of suburban Houston to downtown Houston, partially as a way to accommodate the Houston office's "merger" with the law firm of Clements O'Neill (how poorly that worked out is a story for another time). Howrey's Houston office had low density back when it first settled in downtown, and has lost almost 50% of its headcount since then. Some attorneys will move to Winston, and others won't. What will remain is an even more thinly populated Houston office, and it hardly makes sense for Winston to want that kind of losing proposition. What will likely follow is a physical downsizing of the Houston office into yet another location.
Los Angeles: The Hope Street office has a few floors, but those floors have been underpopulated for years. It would just make sense for what remains to move to Winston's LA offices, which already accommodate 55 or so attorneys (provided, of course, that space is available). But from what I have heard from colleagues, the Winston LA office might not need that much space for Howrey attorneys, anyway. So there's another vacant office, with several floors tied to an expensive lease.
Chicago: Place is a ghost town, and whoever is left can walk over to Winston's mothership in Chicago. So there's a couple more floors with no one to occupy them.
Northern Virginia: From the Howrey website -- "Something tells me Howrey and/or Winston won't be needing this so much any more.
Irvine: Reports are that the lights are all but turned out. Does it make sense to keep the real estate for just a couple of attorneys, anyway? With an office just up the road in LA? Probably not.
East Palo Alto & San Francisco: Not many attorneys remain (or will remain) in either of these offices, and what remains could likely drift in to Winston's San Francisco office space. So there's not one, but two leases with no billable justification.
How much all of this costs is not the question. We know it's a heck of a lot. The real question is: who's going to be left holding the massive bag on these leases? Howrey's partners will definitely be on the hook, but will they draw Winston's partners into the circle of lease liability through this oddly styled merger?