Porsche Design Tower

The car elevator, and the question nobody asks about it

How the car elevator works

The system is genuinely unlike anything else in residential construction. Three elevators are built to carry vehicles. Drivers stay in the car, ride up, and the vehicle is placed into a private garage adjacent to the residence. With 284 spaces across 132 units, most owners can keep two vehicles beside their living room, and some four.

As an idea it is close to perfect for its buyer: no valet, no garage level, no walk, and the cars are visible from inside the apartment. It is the single most effective piece of product design in the Sunny Isles market and it is why the building holds its identity a decade on.

The question nobody asks about it

Here is what no brochure discusses, and what any buyer should establish before offering.

A proprietary vertical vehicle transport system is a long-lived, high-consequence mechanical asset with no off-the-shelf replacement. Three lifts serve 132 households. The questions that follow are entirely practical:

• What does the reserve study assume for the vehicle elevators — servicing, component replacement, and eventual modernisation — and is that line funded?
• Who maintains them, under what contract, and what is the response time? A residential lift out of service is an inconvenience. A vehicle lift out of service means an owner cannot retrieve their car.
• What is the redundancy position? With three units serving the tower, what happens when one is down for scheduled work, and what is the contingency if two are?
• Is there an obsolescence plan? Bespoke systems installed in 2014–2017 will need major modernisation within the life of the building, and the cost is not comparable to a standard elevator programme.

None of this is a reason to avoid the building. It is the reason to read the reserve study line by line rather than skimming the amenity list — because in this tower, the amenity is the mechanical plant.

“Is Porsche Design Tower sinking?” — the straight answer

This is the question people actually type, so here is the honest version rather than either the scare headline or the silence.

What the research found

What the research found. University of Miami researchers used satellite radar interferometry to measure vertical movement in high-rise buildings along Miami-Dade’s barrier islands between 2016 and 2023. Thirty-five buildings showed measurable subsidence of 2 to 8 centimetres. Porsche Design Tower is among the buildings identified, and has been reported as having settled toward the upper end of that range — as much as eight centimetres. The causes given are inconsistent limestone layers and groundwater movement, with construction vibration accelerating the compaction of sandy layers.

What that actually means

What that actually means. Eight centimetres is about three inches, spread across seven years — roughly eleven millimetres a year, in a building that topped out in 2016 and completed in January 2017. A newly completed 641-foot tower consolidating into sandy layers over its first years is expected structural behaviour, not an anomaly. The researchers noted that subsidence in most high-rises slows over time.

The context that gets omitted

The context that is almost always omitted. The same University of Miami team ran the identical analysis over the Champlain Towers South site for the years before June 2021 and reported that “no displacement signals were detected before the collapse, indicating that settlement was not the cause of collapse.” The mechanism being measured here is not the mechanism that killed 98 people at Surfside. The researchers also declined to characterise any building in the study as unsafe.

What a buyer should do

What a buyer should do with this. Not panic, and not ignore it. Ask the association three things: whether it has commissioned its own elevation or settlement survey since December 2024, what that survey shows about rate (still moving, or decelerating), and what it shows about differential movement across the footprint. Uniform settlement is a utilities-and-finishes issue. Differential settlement is the one engineers care about, and satellite data cannot resolve it at the level an owner needs.

Our full analysis of the study — including which buildings it names, which it does not, and why the “next Surfside” framing is wrong — is in the full analysis of the subsidence research.

The milestone position

Under Florida Statute 553.899, a condominium building of three or more habitable storeys must complete a milestone structural inspection by 31 December of the year it turns 30, then every 10 years. The statute then does something most coverage misses: § 553.899(3)(b) lets the local enforcement agency shorten that clock, where local circumstances — expressly including “proximity to salt water” — warrant it.

Miami-Dade County has exercised that discretion. Coastal buildings of three or more storeys completed in 1998 or later are on the 25-year clock; other buildings from 1993 or later remain on 30. Sunny Isles Beach does not administer its own programme — it follows the county’s. So the 25-year figure that applies here is a county determination, not an automatic feature of the statute, and a determination can be revisited.

Porsche Design Tower received its temporary certificate of occupancy in November 2016, and county records carry the building as completed that year. That places the first milestone inspection around 2041. One caveat we will not paper over: a temporary certificate and a final certificate of occupancy can fall in different years, and no final CO date for this building is public. The certificate date is what legally controls, and it should be confirmed from the record before anyone relies on it.

That matters more than it sounds. The subsidence conversation has attached itself to a building that is, in regulatory terms, nowhere near its first structural inspection — while a great deal of the older Sunny Isles and Miami Beach stock is inside that cycle right now, discovering deferred maintenance and assessing for it. Those are very different risk profiles, and the coverage has flattened them into one.

Financing — where any of this reaches price

Since 3 August 2026, Fannie Mae’s Lender Letter LL-2026-03 has retired the Limited Review path for established condominium projects over ten units. Full Review now applies at every down-payment level, so the lender reads the milestone report, the reserve study, the budget and the master insurance policy. A per-unit deductible above $50,000 breaks eligibility, and from 4 January 2027 minimum reserves rise from 10% to 15% of annual budgeted assessment income.

Porsche Design Tower owners can park a car on any of the tower’s 57 floors, featured in Miami condos built for car enthusiasts.

In June 2026, 48.5% of Miami-Dade condominium sales closed in cash — meaning 51.5% needed a lender — in a county carrying 12.3 months of condominium supply with the median down 3.1% year over year. A project that fails Full Review becomes cash-only and loses roughly half its buyer pool.

That is the transmission mechanism. Not a satellite measurement — a document a lender reads.

The price record — and it has fallen in every one of the last four years

The page above answers the two questions people ask about this building. Here is the one they should ask and usually do not, taken from the Miami-Dade County Property Appraiser’s own file rather than from a listing site.

I pulled all 132 folios in the 18555 Collins Avenue Condo declaration. All 132 are residential homes — no commercial, hotel, parking, cabana or storage folio sits in this declaration — and the declaration’s undivided common-element shares close complete. Homes run 3,130 to 8,566 square feet, median 3,171, and the building is almost entirely three-bedroom: 128 of the 132. Six floorplates carry 124 of the 132 homes, with the 3,171 sq ft plan appearing 47 times. On the 2026 tax roll, assessed values run $2,566,024 to $19,075,050, median $3,161,500.

Both columns fall in every single year. Median price is down 22.3% since 2023 and median price per square foot is down 14.9%. I normally have to tell you which of those two lines to trust, because a building whose homes vary in size will move its price median on floorplate mix alone. Here I do not have to: the two measures agree, and they agree four years running.

The direction is real. The magnitude I would not defend to the last point. Twenty-six qualified sales closed across the four years against 132 homes — one home in 20 each year, and only five to eight sales in any single year. That is a thin annual record, and on thin records a single large trade moves a median. What makes me confident about the direction anyway is that it does not depend on the median at all.

Eight homes here share the 6,121 sq ft floorplate, and four of them have traded since 2021. Same size, same layout, same building:

• $16,600,000 — unit 5205, 20 July 2021 — $2,712 per square foot
• $14,400,000 — unit 4405, 30 June 2022 — $2,353 per square foot
• $10,500,000 — unit 5201, 15 December 2023 — $1,715 per square foot
• $13,000,000 — unit 4005, 3 September 2025 — $2,124 per square foot

That is a floorplate-controlled comparison, which no argument about unit mix can touch. It is not a straight line down — the December 2023 sale is the lowest of the four, and 2025 recovered from it — but the 2025 trade still sits 21.7% below the 2021 high on the same floorplate, and the peak of this building’s record is behind it.

The building’s record sale remains $16,600,000 on 20 July 2021, unit 5205. The same home had sold for $10,000,000 on 2 May 2019 — a 66.0% gain in twenty-six months, and a fair marker of how fast the first resale cycle ran here.

Resale history is still short, because the building is young: 16 completed round trips, of which 2 (12.5%) sold for less than the previous owner paid, with a median gain of 7.5% over a median 2.5-year hold. 2026 is an incomplete year — those five sales run only to the pull date.

What I take from it: this is an illiquid building — one home in 20 changes hands each year — where the price per foot has moved down for four consecutive years and where a same-floorplate comparable is almost always available to prove or disprove any asking price. If you are buying, that comparable is your strongest tool and it currently argues for you. If you are selling, price against the 2024–2026 trades on your own floorplate, not against the 2021 print; the 2021 print is the number a buyer’s agent will already have discounted.

The honest summary

Porsche Design Tower is a genuinely singular building: 132 residences in 60 storeys of oceanfront, with a vehicle delivery system that nobody has successfully copied, roughly sixteen years before its first milestone inspection.

It is also a building whose price per square foot has fallen in each of the last four years, on a record thin enough that the same-floorplate comparisons below carry more weight than any median. And it carries a settlement finding at the top of the measured range, which a buyer will find in seconds and should raise rather than avoid. The finding is not evidence of danger, and the same research severs the Surfside comparison it gets paired with. What it justifies is a specific request to the association for building-level monitoring data — which is a reasonable thing to ask, and a very informative thing to be refused.

The under-discussed risk here is not the ground. It is the reserve position on three bespoke vehicle elevators serving 132 households. Underwrite that.

See also Sunny Isles Beach, Eighty Seven Park and the full our full Miami condo coverage market.

Related reading: Jade Signature further south on Collins · the Sunny Isles submarket · the most expensive homes in the county.