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CBO
Chapter 34 addresses this new change for accessible type B units.
.Finally some recognition for existing buildings in 20123411.8.9 Type B dwelling or sleeping units. Where fouror more Group I-1, I-2, R-1, R-2, R-3 or R-4 dwelling or
sleeping units are being added, the requirements of Section
1107 for Type B units apply only to the quantity of the
spaces being added. Where Group I-1, I-2, R-1, R-2, R-3
or R-4 dwelling or sleeping units are being altered and
where the work area is greater than 50 percent of the
aggregate area of the building, the requirements of Section
1107 for Type B units apply only to the quantity of the
spaces being altered