Also, keep in mind how effective snipers in large ruined buildings are. If you have a 10 story wrecked building with plenty of firing positions a group of snipers/ spotters could do ALOT of damage. Or, one sniper constantly switching postions would work well for the player.
Keep in mind thats EXACTLY what the Russians did in the Battle of Stalingrad, so there are historical examples of what im talking about.
Besides, A 10 story, semi-colapsed enterable building would be reward enough in ofp even if you didn't use it for snipers. Imagine the CQBs you could have with that! Not to mention the traditional "Hold the building at all costs" scenario, where you have to hold off wave after wave of enemys from all sides.