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A modular building system for constructing a multi-story building includes pre-fabricated modular units. Each modular unit includes a horizontal slab for forming a floor/ceiling of the building, a joist extending horizontally along a first edge of the slab, the joist extending below the slab and ext

A modular building system for constructing a multi-story building includes pre-fabricated modular units. Each modular unit includes a horizontal slab for forming a floor/ceiling of the building, a joist extending horizontally along a first edge of the slab, the joist extending below the slab and extending horizontally beyond the first edge of the slab to form a receiving lip, columns positioned on top of the slab along the first edge, and connectors installed in cavities formed in the unit. A floor of the multi-story building is formed by arranging the modular units so that the slab of a first modular unit is positioned on the receiving lip of a second modular unit. An additional floor of the multi-story building is formed by arranging the modular units so that the joist portion of an upper modular unit is positioned on the columns of a lower modular unit.

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1. A modular building system for constructing a multi-story building, the system comprising: a plurality of prefabricated modular units, each modular unit comprising a horizontal concrete slab for forming a floor of the building, a concrete joist portion extending horizontally along a first edge of

1. A modular building system for constructing a multi-story building, the system comprising: a plurality of prefabricated modular units, each modular unit comprising a horizontal concrete slab for forming a floor of the building, a concrete joist portion extending horizontally along a first edge of the slab, the joist portion extending below the slab and having a portion that extends horizontally beyond the first edge of the slab to form a receiving lip, a plurality of concrete columns positioned on top of the slab along the first edge, and a plurality of connectors installed in cavities formed in the modular unit, wherein the slab and the joist portion form a bottommost portion of each modular unit,wherein at least one modular unit of the plurality of prefabricated modular units further comprises at least one of (a) a raised floor positioned above the slab and (b) a dropped ceiling positioned below the slab,wherein at least one floor of the multi-story building is formed by arranging the modular units so that the slab of a first modular unit is positioned on the receiving lip of a second modular unit,and at least one additional floor of the multi-story building is formed by arranging the modular units so that the joist portion of an upper modular unit is positioned on the columns of a lower modular unit. 2. The system of claim 1, wherein utility elements are installed between the raised floor and the slab during fabrication of the modular unit. 3. The system of claim 1, wherein utility elements are installed between the dropped ceiling and the slab during fabrication of the modular unit. 4. The system of claim 1, wherein the modular units are formed of cast concrete. 5. The system of claim 1, wherein the columns are cast as part of the modular unit. 6. The system of claim 1, wherein the joist portion is cast as part of the modular unit. 7. The system of claim 1, wherein the joist portion is cast separately from the modular unit and attached to the modular unit. 8. The system of claim 1, wherein the columns are cast separately from the modular unit and attached to the modular unit. 9. The system of claim 8, wherein at least one of the columns comprises a connector arrangement including a cavity, of the cavities formed in the modular unit, that passes completely through the column for receiving a connecting element, the connecting element being movable within the cavity. 10. The system of claim 1, wherein each of the connectors comprises a connecting element fixed within a corresponding cavity, of the cavities formed in the modular unit, the connecting elements being arranged such that the connecting elements of the connectors of adjacent modular units can be joined with a coupler. 11. The system of claim 10, wherein the connecting element is a threaded rod. 12. The system of claim 10, wherein the coupler is configured to allow connected ends of the coupler to move with respect to one another. 13. The system of claim 1, wherein at least one modular unit of the plurality of prefabricated modular units further comprises a prefabricated wall connected to the columns of the modular unit. 14. The system of claim 13, wherein the prefabricated wall comprises a connector arrangement including a cavity, of the cavities formed in the modular unit, that passes completely through the prefabricated wall for receiving a connecting element, the connecting element being movable within the cavity. 15. The system of claim 1, wherein at least one modular unit of the plurality of prefabricated modular units further comprises a plurality of prefabricated walls connected to the columns of the modular unit, the prefabricated walls being arranged to form a utilities section between two parallel walls at an end of the modular unit. 16. The system of claim 15, wherein a plurality of modular units having utility sections are arranged in a row with the utility sections being aligned to allow access to the utility sections from a common hallway. 17. The system of claim 15, wherein the common hallway also provides access to defined entrances of the modular units. 18. The system of claim 1, further comprising a plurality of prefabricated core units, each core unit being formed by a plurality of walls on three sides and a portion of a fourth side. 19. The system of claim 18, wherein the core units are connected together to form a stack for a stair tower or elevator shaft. 20. The system of claim 1, further comprising: a hoist frame having a first end configured to attach to the columns of the modular unit;a plurality of supports configured to hold a second, opposite end of the hoist frame in position above the slab; anda plurality of ties attached to the hoist frame and configured to attach to the slab of the modular unit. 21. The system of claim 20, wherein the hoist frame comprises an accessway arranged between tops of the columns.