Stair expansion joint system with freedom of movement between landings

Stairs with freedom of movement between landings associated therewith, the stairs comprise:

• a plurality of treads and rises;
• a support structure disposed to the plurality of treads and rises;
• an upper connector configured to support an upper portion of the support structure at an upper landing;
• and
• a lower connector configured to support a lower portion of the support structure at a lower landing, wherein the lower connector comprises a sliding base assembly consists of a plurality of plates configured to support horizontal and vertical movement of the support structure relative to the lower landing, and wherein the support structure is substantially fixed between the lower landing and the upper landing;
• wherein at least one of the upper connector and the lower connector structurally supports the support structure for safe egress over the plurality of treads and rises while concurrently supporting movement between the landings by the support structure in at least one dimension, and wherein the movement supports inter-story drift between the landings and removes some force translation between the landings,
• wherein the plurality of plates consists of a first plate connected to the stairs, a second plate connected to the lower landing, and a third plate between the first plate and the second plate, wherein the stairs are moveable relative to the lower landing based on the third plate, wherein the third plate comprises two sides each directly disposed to the first plate and to the second plate and each of the two sides is a same material.