1628 John F Kennedy Blvd

Where 1628 John F Kennedy Blvd is

Its block in Center City Philadelphia, drawn from Philadelphia's own building outlines and street centerlines.

The plan: window line, shape and floor rhythm

39 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.

The typical floor has 438 ft of exterior wall, and across 22 residential floors the building carries 9,628 ft of it in total, divided among the 246 homes this screen estimates.

Its plate is compact at 0.76: close to a square or a circle, the most efficient envelope an office can have and the least generous one for apartments: little perimeter to divide among homes. How window line and plate shape are measured.

At the model’s 750 sq ft average, the plan works out at about 11.2 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.

Why 1628 John F Kennedy Blvd scores 88 out of 100

Daylight efficiency 100, Interior depth 90, Scale 100, Finance 39 — each out of 100, then weighted.

Most of what it earns comes from daylight efficiency, and what holds it back most is finance, at 39 out of 100: remaining gap is 37% of conversion cost, scored from 60% down to 0%.

Built in 1970

Philadelphia records this building as going up in 1970, which puts it in the late-modern stock.

As a rule, typically the hardest to convert: the deepest plates of any era, large central cores, and floor-to-floor heights tight enough that running residential drainage under a ceiling can be the thing that ends a project. That is the era’s general tendency rather than a finding about this building — the model reads an outline and a height, and can see nothing inside — but it is the first thing an architect would want to know, and it colours how much confidence the 90% daylight figure above deserves.

What the conversion would cost

$360 per square foot all-in across 256,434 sq ft of converted floor, or $92.3M in total — about $375K for each of the 246 homes.

That cost is charged across every converted square foot, including the 25,201 sq ft of windowless core, which has to be gutted, re-plumbed and sprinklered like the rest of the building and then earns nothing. Against it the model sets a completed value of $197K a home, which for 246 homes is $48.4M.

What would have to be true

A $43.9M gap before any grant, $33.9M after the modeled one. The smallest single change that would close it: average unit size 41% down.

The shortfall before any grant is $43.9M. Closing it from the value side means each of the 246 homes finishing at $375K rather than the $197K the model assumes — 91% more. Closing it from the cost side means getting all-in cost down from $360 to $189 per square foot.

A modeled RESIDE grant of $10.0M moves that threshold to $335K a home. That is still above the $197K assumed, leaving $33.9M uncovered, which is why the grant does not unlock this one.

Nor do all four levers have to move. For 1628 John F Kennedy Blvd, one alone would close the gap at:

All four are sliders in the survey, where 1628 John F Kennedy Blvd re-scores against your own numbers.

How it compares in Center City Philadelphia

1628 John F Kennedy Blvd ranks 14th of the 100 buildings screened here, against a median score of 67.

Its floor plate is better lit than 65% of them, and shallower than 71% of them at its deepest interior point. On size it is the 48th largest by estimated homes. The full survey of all 100 buildings ranks and maps every one of them, and the list by address links each to its own page.

Within the CMX5 zone

14th of 63 zoned CMX5 — the comparison that shares its rules, rents and streets.

63 of the screened buildings are zoned CMX5. 1628 John F Kennedy Blvd ranks 14th of them against a median score of 67. 28 score 70 or more, their median deepest interior point is 57 ft from a facade against this building’s 44 ft, and together they would hold an estimated 30,185 homes. The group’s top scorer is 112 N Broad St, at 93.

Its nearest match in size: 1880 John F Kennedy Blvd

The screened building closest to 1628 John F Kennedy Blvd in converted floor area is 1880 John F Kennedy Blvd: 259,202 sq ft over 20 stories, against 256,434 sq ft over 23 here.

1628 John F Kennedy Blvd scores 88 to its 92, and with the size held roughly equal most of that shortfall comes from interior depth: 90 out of 100 here, 100 there (deepest interior point 38 ft from a facade, scored from 80 ft down to 40 ft). On the money they sit in the same place: each falls short even with the modeled grant. The two stand about 900 ft apart.

Would it qualify for a RESIDE Act grant?

The model awards 1628 John F Kennedy Blvd $10.0M, on the assumption it qualifies. Whether it does, no published dataset can say.

That figure assumes the building meets the Act’s vacant-and-abandoned test, which turns on code-enforcement and receivership records no city publishes.

It does not sit in a 2018 designated Opportunity Zone, so it would not draw that Section 201 priority.

Other buildings screened near 1628 John F Kennedy Blvd

The 4 closest the screen also covers, from 170 ft away. They are the colored outlines on the plan at the top of this page.

• 1625 Market St
  19 stories · 81% daylit · 270 estimated homes · scores 67/100 (Worth a feasibility study)
  about 170 ft away
• 1701 Market St
  18 stories · 68% daylit · 422 estimated homes · scores 51/100 (Worth a feasibility study)
  about 200 ft away
• 1600 John F Kennedy Blvd
  20 stories · 75% daylit · 414 estimated homes · scores 61/100 (Worth a feasibility study)
  about 210 ft away
• 1601 John F Kennedy Blvd
  28 stories · 68% daylit · 912 estimated homes · scores 55/100 (Worth a feasibility study)
  about 240 ft away