The Taco Bell on State St recently took the unusual step of closing for a month for renovations to incorporate a KFC into the same location. The new Taco Bell/KFC (or, as I've semi-affectionately dubbed it, "Taco Cock") is a very different beast from the familiar old Taco Bell; they completely gutted the place and put in all new furniture and decor in a completely new arrangement, and repainted the white walls a sort of dark red. The chairs features a bell-shaped cut-out, and the walls are plastered with pictures of the Colonel.
This isn't two separate restaurants sharing seating space, either; there's just one counter to order at, and you can get any combination of burritos, tacos and fried chicken you want. My fiance and I usually order the half-pound beef & potato burrito at Taco Bell (cheap, filling, and about as close to healthy as you can get at a place like this), and on our most recent trip we supplemented it with an order of popcorn chicken with one of each dipping sauce (honey mustard, honey bbq, sweet & sour, and ranch -- all good, but we liked the honey mustard and ranch the best). The burritos were still the same as ever, and the chicken was surprisingly tasty -- so much so, in fact, that we went back for a second order.
Added bonus, "Taco Cock" is open 'til 3am, so if it's late at night and you don't have enough cash for Qdoba, or you want a burrito but your SO has his/her heart set on artery-clogging chicken, this is the place to go.