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Per 2021 IBC 1108.6.2.2.1, Type A units are only required where there is more than 20-units. Accessible units are not required at all. The balance of all other units have to be Type B units, but that can be heavily reduced via 1108.7.
2021 IBC
1108.6.2.2 Apartment Houses, Monasteries and Convents
Type A units and Type B units shall be provided in apartment houses, monasteries and convents in accordance with Sections 1108.6.2.2.1 and 1108.6.2.2.2. Bedrooms in monasteries and convents shall be counted as units for the purpose of determining the number of units. Where the bedrooms are grouped in sleeping units, only one bedroom in each sleeping unit shall count toward the number of required Type A units.
1108.6.2.2.1 Type A Units
In Group R-2 occupancies containing more than 20 dwelling units or sleeping units, at least 2 percent but not less than one of the units shall be a Type A unit. All Group R-2 units on a site shall be considered to determine the total number of units and the required number of Type A units. Type A units shall be dispersed among the various classes of units.
Exceptions:
- The number of Type A units is permitted to be reduced in accordance with Section 1108.7.
- Existing structures on a site shall not contribute to the total number of units on a site.
1108.6.2.2.2 Type B Units
Where there are four or more dwelling units or sleeping units intended to be occupied as a residence in a single structure, every dwelling unit and sleeping unit intended to be occupied as a residence shall be a Type B unit.
Exception: The number of Type B units is permitted to be reduced in accordance with Section 1108.7.