Which direction was the aircraft approaching from? From that direction, would the nature of the building been obvious to the crew as being a busy bar, or perhaps apparently just an anonymous building with a flat roof, and more attractive as a landing point than a busy road - reports of groups of passers-by later helping with rescue suggests the street may have been quite busy.
Or, from the approach direction, would the path have had to pass over the bar to reach the apparently spacious crossroads, so that the aircraft may not have had enough energy to pass over the building to reach the junction (even by really milking the last of the energy form the rotor at the last moment to the point where flight could no longer be sustained?)
A very obstructed built-up area would be a very hostile environment to complete an engines-off landing even if full control was available and the crew may be unlikely to have the luxury of more than a "barely-suitable" option to try to get down into.