All the buildings were made of concrete, or perhaps bricks or stone blocks with mortar troweled over them. It didn’t really matter. The point was that the walls would stop low-velocity rounds and shotgun pellets, and you couldn’t kick your way through them. They would not burn very easily. Depending on how much rebar had been used—and his guess was that the builders had cut plenty of corners in that department—these structures, compared to wood- or steel-framed ones, would be more vulnerable to collapse under the exceptionally stressful conditions that frequently obtained when men like Sokolov were earning their pay. They were four or five stories high, which meant that they did not have elevators and that, if it was like Europe, the highest floors would house the poorest people. Ground floors tended to be retail; upper stories were offices (on larger streets) or apartments (smaller). Apartments quite frequently sported small balconies, but these had invariably been retrofitted with grids of steel bars, even on the upper floors—apparently burglars here climbed walls and abseiled from rooftops. The grids themselves looked eminently climbable and so might be handy for gaining access to a roof when doors were locked, or to depart from a building when stairwells were filled with products of combustion or men with guns who wanted to kill him. Some ropes might come in handy. But really, when wasn’t that the case?