Its a two story building with a flat roof and a balcony. Access to the roof is either up a ladder on the side or up a stairwell inside. The roof and the first floor are removable to allow figures to be place inside.
I know it's not quite a shanty, but even in shanty towns you are going to have to go some where to buy your food and AK47 ammunition. It adds a bit of height to the battle field, and as it is one of the only brick build structures in the area, I am sure it will be a desirable objective in a fire fight.
I am going to add some market stalls, and build the dilapidated church that also features in those COD: MW3 missions.
I can even remove the balcony floor all together and opt for a single story building with a flat roof.