Section 1104 requires that a percentage of dwelling units in multi-family buildings be accessible and include adaptable features. Accessible units must provide wheelchair accessibility throughout, with accessible bedrooms, bathrooms, and common areas. Kitchens must have accessible counter heights and clearances. Bathrooms must have accessible sinks, toilets, and grab bars. Adaptable units include features that can be modified for accessibility by occupants or future modifications. Type A units are fully accessible. Type B units are adaptable and can be modified for accessibility. The percentage of accessible units required depends on the total number of units, typically 2-7 percent for accessible units with additional units as adaptable.