I find myself liking both versions equally :) - the b&w really gets at all the juicy detail and contrasts, while the color seems to evoke more of a mood and sense of place - it's a matter of emphasis
Interesting our reactions after having in memory the color version. Each version is interesting in a different way. Here the pitch black windows are the villains and in their blind way seem to cast a foreboding shadow
And I prefer the black and white :) I think the light over the door is nicer here. Not sure about the interior (esp EXIT and the sign below it) - it certainly recedes here but I haven't decided yet whether I think that's good or bad.
Personally, I prefer the color original. This black and white conversion strikes me as too contrasty, whereas the colors in the original were quirkily harmonious. The mood in the original is more welcoming, but all this is certainly a matter of personal artistic vision.