1103.2.5 Construction sites. Structures, sites and equipment
directly associated with the actual processes of construction
including, but not limited to, scaffolding,
bridging, materials hoists, materials storage or construction
trailers are not required to comply with this chapter.
I don't have commentary for this, but "construction trailers" might not be intended to mean "office trailers"....Not sure if you would get out of it if you only had offices on the second floor and common functions on the first?
1104.4 Multistory buildings and facilities. At least one
accessible route shall connect each accessible story, mezzanine
and occupied roofs in multilevel buildings and facilities.
Exceptions:
1. An accessible route is not required to stories, mezzanines
and occupied roofs that have an aggregate area
of not more than 3,000 square feet (278.7 m2) and
are located above and below accessible levels. This
exception shall not apply to:
1.1. Multiple tenant facilities of Group M occupancies
containing five or more tenant
spaces used for the sales or rental of goods
and where at least one such tenant space is
located on a floor level above or below the
accessible levels.
1.2. Stories or mezzanines containing offices of
health care providers (Group B or I).
1.3. Passenger transportation facilities and airports
(Group A-3 or B).
1.4. Government buildings.
2. Stories, mezzanines or occupied roofs that do not
contain accessible elements or other spaces as determined
by Section 1107 or 1108 are not required to
be served by an accessible route from an accessible
level.
3. In air traffic control towers, an accessible route is
not required to serve the cab and the floor immediately
below the cab.
4. Where a two-story building or facility has one story
or mezzanine with an occupant load of five or fewer
persons that does not contain public use space, that
story or mezzanine shall not be required to be connected
by an accessible route to the story above or
below.