A customizable facility (10; 110; 1400) for manufacturing at least one pharmaceutical product, the customizable facility (10; 110; 1400) comprising: at least one central unit (38; 114) positioned on a ground surface floor of the customizable facility; and a plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) in communication with the at least one central unit (38; 114) such that the at least one central unit provides shared utilities to the plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116), and a shell (36; 112), wherein the at least one central unit (38; 114) is positioned at least partially within the shell (36; 112) and the plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) are positioned at least partially within the shell (36; 112), wherein the plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) are arranged to maximize a number of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) within the shell (36; 112) while minimizing a footprint of the shell (36; 112), characterized in that the plurality of modular units (40, 40A; 40B; 40C; 40D; 40E; 116) include a fermentation unit, a a pre-viral unit, a post-viral unit, a utility space, a warehouse, a media buffer facility, an office, a personnel unit, a fill-finish unit, a dosage formulation unit, a packaging unit, and at least one corridor connecting at least two of the modular units to one another, and at least one second corridor connecting at least two of the modular units of the second set of modular units to one another, wherein the at least one corridor and the at least one second corridor are connected to the warehouse unit disposed within the shell and wherein the customizable facility comprises two manufacturing wings (22A, 22B), which are configured to contain modular units for a product line and the different modular units within the manufacturing wings (22A, 22B) can be used to produce completely different products in the same customizable facility and wherein additional modular units, an additional manufacturing wing or another component of the customizable facility are positioned horizontally adjacent to the first manufacturing wing and/or the second manufacturing wing. at least one central unit (38; 114) positioned on a ground surface floor of the customizable facility; and a plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) in communication with the at least one central unit (38; 114) such that the at least one central unit provides shared utilities to the plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116), and a shell (36; 112), wherein the at least one central unit (38; 114) is positioned at least partially within the shell (36; 112) and the plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) are positioned at least partially within the shell (36; 112), wherein the plurality of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) are arranged to maximize a number of modular units (40; 40A, 40B, 40C, 40D, 40E; 116) within the shell (36; 112) while minimizing a footprint of the shell (36; 112), characterized in that the plurality of modular units (40, 40A; 40B; 40C; 40D; 40E; 116) include a fermentation unit, a a pre-viral unit, a post-viral unit, a utility space, a warehouse, a media buffer facility, an office, a personnel unit, a fill-finish unit, a dosage formulation unit, a packaging unit, and at least one corridor connecting at least two of the modular units to one another, and at least one second corridor connecting at least two of the modular units of the second set of modular units to one another, wherein the at least one corridor and the at least one second corridor are connected to the warehouse unit disposed within the shell and wherein the customizable facility comprises two manufacturing wings (22A, 22B), which are configured to contain modular units for a product line and the different modular units within the manufacturing wings (22A, 22B) can be used to produce completely different products in the same customizable facility and wherein additional modular units, an additional manufacturing wing or another component of the customizable facility are positioned horizontally adjacent to the first manufacturing wing and/or the second manufacturing wing.