This bill mandates that the United States Postal Service (USPS) must provide curbside mail delivery to residents within specific housing developments. It further prohibits the USPS from expending any funds to discontinue or otherwise restrict curbside delivery services in these designated areas, ensuring the continuation of this service. The legislation precisely defines a "housing development" as a cluster containing 50 or fewer single-family homes , located within a subdivision, neighborhood, or similar residential grouping. A key criterion for this definition is that the cluster must be situated within 300 yards of any other residence that already receives curbside mail delivery, thereby focusing on areas adjacent to existing curbside routes.