(605 S Vista - Stair Addition) For the construction of a new exterior stair to replace the original set of stairs to the second story residential unit with work to include removal of the remaining landing and construction of a new set of wood stairs, landing and all associated handrails. The area below the apartment is required to be separated from the residential by a minimum one hour rated assembly. No new work is being done in the existing apartment with the exception of misc. electrical, plumbing and mechanical work. All work per the approved plans and the attached engineering. CDM