|A Plus Warehouse designs, delivers and installs inplant offices and inplant buildings nationwide. Our prefabricated inplant offices are made by National Partitions, PortaKing, Portafab, and other fine names. Our National Partitions buildings are available nationwide with factory installation. A Plus Warehouse sells inplant offices and inplant buildings with or without load bearing roofs. We also provide prefabricated mezzanines to accompany the modular offices you require. Many customers require outdoor buildings, and A Plus Warehouse now accommodates those needs as well. Come to A Plus Warehouse for your inplant office needs, or just fax your requirement to the prefabricated office building engineering line at 800-244-6231. A Plus Warehouse is clearly your modular office building source.