In this section, “qualified project” means a residential project that: consists of new construction or substantial renovation, as annually established and identified by the Department of Housing and Community Development in the Multifamily Rental Financing Program Guide; is on property that: was formerly owned by the State; consists of more than one building; includes at least one building that was built more than 50 years before the date of application for the project; and is appropriate for redevelopment as determined by the Secretary of Housing and Community Development; or is currently or was formerly owned by the federal government; is greater than 80 acres in size; and was the site of a former U.S. military reservation; contains at least 25% of units that are affordable dwelling units; and is deed–restricted to include 25% of units that are affordable dwelling units for a period of at least 40 years. 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, a qualified project may consist of mixed–use development with density limits that do not exceed the highest allowable density in the local jurisdiction’s multifamily residential zones: in an area zoned for nonresidential use; or on land that: is currently or was formerly owned by the federal government; is more than 80 acres in size; and was the site of a former U.S. military reservation. In an area zoned for mixed–use, a qualified project may consist of residential development with density limits that do not exceed the greater of the following: the highest allowable density in the local jurisdiction’s residential zones; or six units per gross acre. 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 § 7–503 or § 7–504 of this subtitle.