Create new feature of population  by geoprocessing tols

Discussion created by musttaleb on Apr 9, 2013
Please,  could you help me.

I have a polygon layer representing the buildings of the city. In this layer there is a field indicating the corresponding population of each building.

From this building layer i want to create automatically a new future class of contiguous areas which  contains population "between 200 and 300 households." The population of each area is the sum of the population of the building contiguous it contains.