This bill amends the Internal Revenue Code of 1986 to create a new exclusion from gross income for certain real property sales. It allows taxpayers to exclude any gain from the sale of qualified real property interests when sold to a qualified organization for purposes related to the Department of Defense's Readiness and Environmental Protection Integration (REPI) program . This aims to incentivize landowners to participate in conservation efforts that support military readiness by protecting critical buffer zones around military bases. A qualified real property interest encompasses the taxpayer's entire interest, a remainder interest, or a perpetual restriction on land use, with sales considered for REPI purposes if conducted under the authority of the DoD's program. This encourages the preservation of environments surrounding military installations. A limitation prevents pass-through entities from using the exclusion if they acquired the property within three years of the sale, though an exception exists for family partnerships and other family pass-through entities. The amendments will apply to taxable years beginning after the Act's enactment.