Affordable housing AKA, IZ (inclusionary zoning)

Hi All,

I'm entertaining the idea of digging out the basement of my fourplex in DC, and maybe even adding another floor (pop up) at the same time. Potentially, this could turn the fourplex into an eight-plex. One thing that might have an effect on this is the affordable housing law in DC, which is called inclusionary zoning. On their website it states regarding rehabs that projects that will require to comply with IZ are:

rehabilitation projects that are expanding an existing building by 50 percent or more and adding10 or more units.

Just reading this, its unclear whether you have to have affordable units only if you expand a building by 50% or if you expand a building by 50% and in doing so add 10 or more units. It seems like the latter, which would be great.

Basically, I'm wondering if I would be required to make one of the new units affordable housing.

Thanks!

Aaron