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A multi-level apartment building includes vertically stacked sections each containing at least one pair of apartments, where each apartment of an apartment pair contains a stairway assembly coupled to a vertically extending stair support wall assembly that contains utility distribution conduits. The

A multi-level apartment building includes vertically stacked sections each containing at least one pair of apartments, where each apartment of an apartment pair contains a stairway assembly coupled to a vertically extending stair support wall assembly that contains utility distribution conduits. The stairway assembly for each apartment connects four levels of function space. One apartment of the pair in a vertical section is rotated 180 degrees in plan in relation to the other apartment of the pair which is entered on the opposite side of a public corridor that provides access to the apartments of the pair. The apartments are vertically stacked in alignment where an apartment of a pair is mirrored in plan in relation to a vertically underlying or overlying apartment of another pair, and the stair support assemblies of the respectively vertically stacked apartments are vertically aligned.

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What is claimed is: 1. A multi-level building system comprising: a plurality of vertical sections, wherein each vertical section includes at least one pair of first and second apartments and wherein the first apartment of the pair is rotated 180 degrees in plan, in relation to the second apartment

What is claimed is: 1. A multi-level building system comprising: a plurality of vertical sections, wherein each vertical section includes at least one pair of first and second apartments and wherein the first apartment of the pair is rotated 180 degrees in plan, in relation to the second apartment of the pair, and about a public corridor; a vertically extending stair support wall assembly in each of the first and second apartments, respectively, of the at least one pair, wherein each of the stair support assemblies includes first and second opposing major faces and first and second opposing lateral faces, wherein the first lateral face faces a wall of the public corridor through which the apartment is entered, wherein the first lateral face is spaced from the entry wall of the public corridor for permitting passage between the entry wall and first lateral face; wherein each of the first and second apartments includes first, second, third and fourth levels of function space connected by a stairway system coupled to the stair support assembly; and wherein the stairway system comprises: a first set of risers defining a first stairway of a first vertical height, wherein the first set of risers extends along the first major face of the stair support assembly and between a first landing at the level of the public corridor and a second landing, wherein the second landing is less than one-half story below the plane of the first landing and wherein the first and second landings are at the first and second levels, respectively, wherein the first landing abuts the first lateral face of the stair support assembly and extends horizontally away from the second major face of the stair support assembly to the first function space, wherein the second landing abuts the second lateral face of the stair support assembly and a portion of the first major face and extends horizontally away from the first major face and second lateral face to the second function space; a second set of risers defining a second stairway of a second vertical height, wherein the second set of risers extends along the second major face of the stair support assembly and between the second landing and a third landing, wherein the third landing is below the plane of the second landing, wherein the third landing is at the third level which extends horizontally away from the lowest riser of the second stairway to the third function space, wherein the third function space extends beneath and away from the public corridor in a direction opposite to that of the direction of entry into the apartment; a third set of risers defining a third stairway of a third vertical height, wherein the third set of risers extends along the second major face of the stair support assembly and between the first landing and a platform from which a level of function space does not extend horizontally away, wherein the platform is above the plane of the first landing and within the function space of the second level; and a fourth set of risers defining a fourth stairway of a fourth vertical height, wherein the fourth set of risers extends along the first major face of the stair support assembly and between the platform and a fourth landing, wherein the fourth landing is at the fourth level, is above the plane of the platform and extends horizontally away from the first lateral face to the fourth function space, wherein the fourth function space extends above the public corridor and away from the plane of the wall of the public corridor through which the apartment is entered in a direction opposite to that of the direction of entry into the apartment; wherein each of the apartments in each of the vertical sections is arranged laterally in a mirrored relationship to each adjacent apartment about a demising wall, wherein the vertical sections next above and below are stacked such that the orientation of the apartments vertically aligned next above and below is the same as that of the mirrored apartments laterally adjacent. 2. The system of claim 1, wherein the second landing is a split-level distance below the first landing. 3. The system of claim 1, wherein the platform is sufficiently above the second landing to provide head room for passage on the second level. 4. The system of claim 1, wherein the first function space includes a dining room and kitchen, the second function space includes living room, the third function space includes a master bedroom and the fourth function space includes at least one minor bedroom. 5. The system of claim 4, wherein the first function space further includes a powder room, an entry wardrobe and ancillary space. 6. The system of claim 4, wherein the third function space further includes bathroom and ancillary space. 7. The system of claim 4, wherein the fourth function space further includes a bathroom, an interior balcony with ancillary space overlooking the living room of the second function space. 8. The system of claim 1, wherein the stair support wall assembly includes vertical service risers and is vertically and laterally aligned with a chase wall permitting direct passage of the risers without offsets, wherein the risers extend in sequence through the third, first and fourth levels in apartments above the stair wall assembly, and in sequence through the fourth, first and third levels respectively in apartments below the stair wall assembly, and through a next stair wall assembly above and below, exposed respectively at the second levels. 9. The system of claim 1, wherein each of the third and fourth levels has a minimum room height and wherein each of the first level and the public corridor has a height that is greater than the minimum room height. 10. The system of claim 1, wherein a same vertical section includes a plurality of apartment pairs, and the corridor for the same vertical section connects the first level corridor for the same vertical section connects the first level of the first apartment to the first level of the second apartment for each of the respective apartment pairs included in the same vertical section. 11. The system of claim 10, wherein the third and fourth levels of each of the apartments has an external view and the first and second levels of each of the apartments has an external view that is on the opposite side of the building system relative to the external views for the third and fourth levels. 12. The system of claim 1, wherein the second level has a room height equal to the sum of (i) twice the vertical distance between the first and second levels and (ii) the height of the first function space. 13. The system of claim 1, wherein the first and second apartments are identical. 14. A multi-level building comprising: a plurality of vertical sections, wherein each vertical section includes at least one pair of first and second apartments and wherein the first apartment of the pair is rotated 180 degrees in plan, in relation to the second apartment of the pair, and about a public corridor having a floor and with a first height; wherein each of the first and second apartments includes first, second, third and fourth levels of function space; wherein the first level is substantially coplanar with the floor of the corridor and defines a first function space having a height equal to the first height, wherein the first height is greater than a minimum story height; wherein the second level occupies a plane below the first level and defines a second function space having a height equal to (i) twice the vertical distance between the first and second levels, plus the height of the first function space or (ii) the sum of the vertical distance between the first and second levels, the height of the first function space and the vertical distance between first and second levels next above; wherein the third level occupies a plane below the first level and defines a third function space having a height equal to a single story, wherein an extent of the third level, nearest the public corridor is excised, such that the width and length of a stair penetration can accommodate headroom for a stairway of an apartment next below, wherein the third level includes a corridor for connecting to a stair extending from the second level; and wherein the fourth level is substantially coplanar with a top of the first function space and defines a fourth function space having a height equal to a single story, wherein a height over a portion of the fourth level adjoining the excision for stair headroom includes an augmented vertical distance; wherein the first and second levels extend from a wall of the public corridor through which the apartment is entered to a principle fenestrated façade on a same side of the building; wherein the third level is below the plane of the public corridor and the fourth level extends over the public corridor, from the entry wall of the public corridor, to a principle fenestrated façade opposite the principle façade to which the first and second levels extend; wherein each apartment pair in a first vertical section is arranged laterally in a mirrored relationship to each adjacent pair about a demising wall, wherein the vertical sections next above and below are stacked such that the orientation of the apartments vertically aligned next above and below is the same as that of the mirrored apartments laterally adjacent, wherein a first level of the first apartment of the first vertical section immediately overlies a third level of the second apartment of the apartment pair in the first vertical section, wherein a second level of the first apartment of the first vertical section immediately overlies a fourth level of the second apartment in the second vertical section, wherein a third level of the first apartment of the first vertical section immediately overlies a second level of the second apartment in the second vertical section, and wherein a fourth level of the first apartment of the first vertical section immediately overlies a first level of the second apartment in the first vertical section. 15. The system of claim 14, wherein each of the vertical sections is bounded by first and second vertically continuous load-bearing walls extending across the building from the one principle façade to the other principle façade, thereby demising each apartment pair from the next, wherein the first and second load-bearing walls are penetrated by the public corridor at the first level of the apartments of the apartment pairs of each of the vertical sections. 16. The system of claim 15 further comprising: a third vertically continuous load-bearing wall located between the first and second levels within each of the apartments of the apartment pairs, extending parallel to the first and second load-bearing walls and toward the one principle façade and the other principle façade at the opposite sides of the building, and being penetrated by the public corridor and at least one interior passage, thereby separating and laterally supporting one side of the first and second levels within each of the apartments of the apartment pair, wherein the demising walls support the other side of the first and second levels.