84-unit residential new construction, zoned CMX5.



A 12-story residential high-rise holding 84 units has delivered at 1813 Ranstead Street in Rittenhouse, making efficient use of a compact 4,601-square-foot lot. The Type I-B structure includes a basement and roof decks, with full sprinkler coverage and standpipe installation in the exit stairways. An amendment filed in April 2025 adjusted the building's occupied area, gross floor area, and fire separation distance while tweaking the southern-wall openings, with corresponding zoning approvals addressing changes to the structure's bulking and massing.
The CMX5 zoning on this slender Ranstead parcel allowed the project to rise by right, leveraging the district's generous height and density parameters to slot 84 homes into less than 5,000 square feet of ground. Pier 40 North Associates, the owner of record, picked up the property in 2023 and moved quickly to construction, clearing regulatory hurdles by late 2024 before wrapping the building in time for the spring 2025 tweaks that refined the envelope and fire-safety configuration.
The project joins a modest but steady wave of infill development in this stretch of Rittenhouse, most notably the 121-unit tower at 2012–14 Chestnut Street within a half-mile radius. Together, these two buildings account for more than 200 new units on previously underbuilt sites, a pattern that's likely to continue as shallow lots and older low-rise commercial structures come into play. Ranstead's auto-repair shops, surface parking, and one-story retail holdouts all sit in the same zoning district, and the math that worked at 1813 could work just as neatly a block over.
The quick turnaround from acquisition to delivery—roughly two years—suggests that smaller, by-right projects in established neighborhoods remain an attractive proposition even as construction costs and interest rates have crimped larger assemblages elsewhere in the city. With CMX5 covering much of the Rittenhouse grid, expect more developers to eye similar mid-block opportunities where land prices can still pencil against the revenue from eight or nine dozen apartments stacked a dozen floors high.
📄 View the project's plan drawings (PDF)As this density arrives, InvestPHL is tracking 65 under-built parcels within a half-mile that a developer could still acquire and build — each carrying a builder's max bid. Addresses and figures are members-only.
Unlock the 65 nearby opportunities →Major (8+ unit) new-construction projects filed within a half-mile since 2022 — the density gathering around this site.