Buildable area means that portion of the established development parcel which can be devoted to buildings and structures. Generally, this area is bounded by any applicable building restriction lines, right-of-way lines and development parcel lines. It shall be the buildable area of a development parcel rather than “lot,” as it is established in the DC Zoning Regulations, that will be utilized to establish the maximum gross floor area of a development within specified portions of the Development Area.