Elevators are only required in buildings 4 or more stories as a means of egress.
Ramps are also an accessible route.
Check out all the exceptions, maybe #4 will help you.
1104.4 Multistory buildings and facilities. At least one
accessible route shall connect each accessible story and mezzanine
in multilevel buildings and facilities.
Exceptions:
1. An accessible route is not required to stories and
mezzanines 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); or
1.4. Government buildings.
2. Stories or mezzanines 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.
