Passing by 15th & Valencia tonight, I saw that Opium Den is now open in the space briefly occupied by Baku, on the SW corner of the intersection. Opium Den's menu, like Baku's, is Thai, but more traditional, less fusiony, and less expensive. The majority of dishes are $8 and under. The menu has the standard curries, noodles, and salads, with a vegetarian section of seven or eight dishes.
The place was empty when I walked past at 7:30 and again at 10.
Don't know if it's the same ownership, but the decor looks almost unchanged.
Anyone try it yet?