In this section the following words have the meanings indicated. “Qualified project” means a residential project that: consists of new construction or substantial renovation; is on property that is located within three–quarters of a mile of a rail station located in the State; except as provided in item (iv) of this paragraph: contains at least 15% of units that are affordable dwelling units; and is deed–restricted to include 15% of units that are affordable dwelling units for a period of at least 40 years; and in a county or municipality that, on or before December 31, 2024, has requirements equal to or exceeding the requirements under item (iii) of this paragraph: contains at least 20% of units that are affordable dwelling units; and is deed–restricted to include 20% of units that are affordable dwelling units for a period of at least 40 years. “Rail station” means a present or planned: MARC station along the Penn, Camden, or Brunswick lines; Baltimore Metro SubwayLink station; Baltimore Light RailLink station; Metrorail system station in the State; or any other passenger rail station. This section does not apply to: a property located within three–fourths of a mile of a rail station in the State if: the rail station is located on the campus of an institution of higher education as defined in § 10–101 of the Education Article; or only a portion of the property is located within the three–fourths of a mile of the rail station; or an area zoned for single–family residential use: on January 1, 2024; and during any process to increase allowable density under subsection (c) of this section. In accordance with this subsection, a local jurisdiction shall allow the density of a qualified project to exceed the density otherwise authorized in a district or zone. In an area zoned for single–family residential use, a qualified project may include middle housing units. In an area zoned for multifamily residential use, a qualified project: shall have a density limit that exceeds by 30% the allowable density in that zone for uses that are not part of a qualified project; and may consist of mixed–use. Subject to § 7–509 of this subtitle, in an area zoned for nonresidential use, a qualified project may consist of mixed–use, with density limits that do not exceed the highest allowable density in the local jurisdiction’s multifamily residential zones. In an area zoned for mixed–use, a qualified project may include 30% more housing units than are allowed in that zone for uses that are not part of a qualified project. If a qualified project is allowed to exceed the density otherwise authorized by a local jurisdiction in a district or zone under this section, the qualified project may not also exceed the authorized density under § 7–502 or § 7–504 of this subtitle.