The German cockroach Blattella germanica (L.) (Blattodea, Ectobiidae) is one of the most common indoor pests in multifamily housing communities. Our objectives were to investigate the spatial distribution patterns of German cockroach infestations in a multiunit dwelling before and after building-wide integrated pest management (IPM) implementation. The study was conducted in a high-rise apartment building with 188 residential units in Paterson, New Jersey. All the identified infestations were treated by researchers using IPM implementation, and monitoring was repeated at 6 and 12 mo after the initial survey. We examined cockroach spatial distribution patterns within and between apartments. Traps placed by the stove and refrigerator caught significantly more cockroaches than traps placed in the kitchen cabinet under the sink or in the bathroom. At month 0, cockroach infestations within the building were spatially correlated. At 12 mo after implementation of IPM, only infestations cross the floors remained to be correlated. Therefore, IPM not only eliminates cockroach infestations in individual units, but also reduces cockroach dispersal between units.