A rapid deployment cleanroom system (100, 200, 600) comprising: multiple modular building structures (320, 322, 324, 326, 328, 330) positioned side-by-side with respect to each other, each modular building structure (320, 322, 324, 326, 328, 330) having a longitudinal dimension and a lateral dimension, each modular building structure (320, 322, 324, 326, 328, 330) comprising: a floor, a ceiling, and at least two walls defining an interior; hollow tubes extending laterally across the modular building structure (320, 322, 324, 326, 328, 330) and below the floor of or above the ceiling of the modular building structure (320, 322, 324, 326, 328, 330); and in two or more of the modular building structures (320, 322, 324, 326, 328, 330), a utility panel having a set of connections for power outlets, data, pressurized gas, and water, a longitudinal location of the utility panel within the interior of each of the two or more modular building structures (320, 322, 324, 326, 328, 330) being substantially identical among the modular building structures (320, 322, 324, 326, 328, 330); and fasteners within the hollow tubes of the modular building structures (320, 322, 324, 326, 328, 330) configured to join the modular building structures (320, 322, 324, 326, 328, 330) together, wherein the joined modular building structures (320, 322, 324, 326, 328, 330) form a large sealable, sterilizable cleanroom, wherein the utility panels of the modular building structures (320, 322, 324, 326, 328, 330) are aligned with one another in the cleanroom interior. multiple modular building structures (320, 322, 324, 326, 328, 330) positioned side-by-side with respect to each other, each modular building structure (320, 322, 324, 326, 328, 330) having a longitudinal dimension and a lateral dimension, each modular building structure (320, 322, 324, 326, 328, 330) comprising: a floor, a ceiling, and at least two walls defining an interior; hollow tubes extending laterally across the modular building structure (320, 322, 324, 326, 328, 330) and below the floor of or above the ceiling of the modular building structure (320, 322, 324, 326, 328, 330); and in two or more of the modular building structures (320, 322, 324, 326, 328, 330), a utility panel having a set of connections for power outlets, data, pressurized gas, and water, a longitudinal location of the utility panel within the interior of each of the two or more modular building structures (320, 322, 324, 326, 328, 330) being substantially identical among the modular building structures (320, 322, 324, 326, 328, 330); and fasteners within the hollow tubes of the modular building structures (320, 322, 324, 326, 328, 330) configured to join the modular building structures (320, 322, 324, 326, 328, 330) together, wherein the joined modular building structures (320, 322, 324, 326, 328, 330) form a large sealable, sterilizable cleanroom, a floor, a ceiling, and at least two walls defining an interior; hollow tubes extending laterally across the modular building structure (320, 322, 324, 326, 328, 330) and below the floor of or above the ceiling of the modular building structure (320, 322, 324, 326, 328, 330); and in two or more of the modular building structures (320, 322, 324, 326, 328, 330), a utility panel having a set of connections for power outlets, data, pressurized gas, and water, a longitudinal location of the utility panel within the interior of each of the two or more modular building structures (320, 322, 324, 326, 328, 330) being substantially identical among the modular building structures (320, 322, 324, 326, 328, 330); and fasteners within the hollow tubes of the modular building structures (320, 322, 324, 326, 328, 330) configured to join the modular building structures (320, 322, 324, 326, 328, 330) together, wherein the joined modular building structures (320, 322, 324, 326, 328, 330) form a large sealable, sterilizable cleanroom, wherein the utility panels of the modular building structures (320, 322, 324, 326, 328, 330) are aligned with one another in the cleanroom interior.