Millennium, Sunny Isles Beach: What Buyers Should Check

Millennium is a 34-story oceanfront residential condominium at 18671 Collins Avenue in Sunny Isles Beach, completed in 1999 — one of the older towers on the oceanfront strip, and a much smaller, quieter building than the 2000s mega-towers around it. It was designed by Arquitectonica, and inside are 117 residences — no studios, no one-bedrooms, nothing under 1,680 square feet. Two floor plans cover 84% of the building: 49 homes at 1,680 square feet and 49 at 2,210 square feet. This is a big-home building with a boutique feel — four residences per floor, private elevators opening directly into the homes — and it trades rarely: only two sales in the 12 months to October 2026, about one home in 36 changing hands in a typical year. The monthly bill is low for the oceanfront at about $0.88 per square foot. Two things a buyer must look into before anything else: the building sued its neighbor, the Porsche Design Tower development team, in 2016 over construction-vibration damage, and settled in 2018 — and as a 1999 oceanfront building, its first milestone inspection was due around 2024, so the inspection and reserve position are live questions, not distant ones.

The facts

• Address: 18671 Collins Avenue, Sunny Isles Beach, FL 33160
• Completed: 1999 (one source says 1998)
• Stories: 34 (some sources say 33, one says 36)
• Residences: 117 (county records: 128 folios at the address, 117 of them homes; other sources say 120 or 127)
• Developer: could not verify
• Architect: Arquitectonica
• Unit mix: 54 two-bedrooms, 60 three-bedrooms, 3 four-bedrooms (county records)
• Unit sizes: about 1,680 to 3,890 sq ft; median about 2,210 sq ft (county records); two floor plans cover 84% of the building — 49 homes at exactly 1,680 sq ft and 49 at exactly 2,210 sq ft
• Waterfront: oceanfront, direct beach access, with over 400 feet of private beach frontage per one building directory

Amenities and day-to-day living

Millennium's amenity program is resort-style but on a boutique scale: a heated oceanfront pool with Jacuzzi and sundeck with private cabanas, a two-story gym, steam and traditional sauna, a tennis court, a putting green, a party room, a business center, a billiards room, barbecue and picnic areas, a playground, bike storage, and beach service with towels and chairs — plus 24-hour security and concierge, valet parking, and a dedicated dog walk area. Residences have private elevators opening directly into the foyer, floor-to-ceiling windows, marble floors, European cabinetry, and balconies on all sides with views of the Atlantic and the Intracoastal. The building trades thinly: 2 sales in the 12 months to October 2026 at a median of about $914 per square foot on the county record, and 13 sales in four years — so comparables are scarce and often stale, and a seller should expect to wait. About 7 residences were listed for sale in November 2026, from about $1,399,000 to $2,700,000, and rentals were listed from about $5,250 a month.

What to check before you buy

• Monthly cost, honestly. No verified building-wide dues figure was found. Across current listings, the association fee runs about $1,400 to $1,986 a month; single-unit examples show $1,936 a month for a 2,210 sq ft three-bedroom (#1401) and $1,476 a month for a 1,680 sq ft two-bedroom (#404) — both working out to about $0.88 per square foot per month. Listings say the fee includes cable and internet, water, and a total appliance service, but confirm what the dues cover for the residence you are considering, including whether any special assessment is already levied or pending — and use the monthly-cost worksheet in the Buyer's Guide, not just the mortgage payment.
• Milestone inspection — due now, not later. Florida milestone inspection rules generally apply at 30 years, or 25 years within 3 miles of the coast. This is an oceanfront building completed in 1999, so its first milestone inspection falls around 2024 on the 25-year coastal rule — a derived estimate, not a confirmed date. One MLS listing sheet for a unit here states 25 Year Structural Engineering And Sirs Completed 2024, but that is a single, undated listing document and could not be independently verified. Ask the association for the actual milestone report, the Structural Integrity Reserve Study (SIRS), and whether any assessments followed from them. Do not take the listing sheet's word for it.
• Reserves and assessments. Ask what reserves are funded, what assessments are planned or already approved, and where the building stands on its SIRS. Under Florida's SIRS rules, reserves for SIRS items are no longer waivable — but confirm this building's position with its association. One older listing sheet said No Assessments for its unit, but that is stale and unit-specific, not a building-wide figure. No verified current reserve or assessment figures were found in public sources.
• The 2016 lawsuit against the Porsche Design Tower team — ask what was fixed and what it cost. In 2016 the Millennium condominium association sued Dezer Development and the entire Porsche Design Tower development team in Miami-Dade Circuit Court, alleging that vibrations from driving foundation sheet pilings for the Porsche tower next door (work that began in 2013) cracked Millennium's lobby, parking garage, and pool deck. The association's engineering report, by two Florida Atlantic University professors, attributed the cracks to the construction vibrations, and the association's attorney said about $4 million in damages had been identified, including about $1 million to repaint and resurface the building. The case was dismissed with prejudice in April 2018 after the parties settled, on terms that were not disclosed. That means the claim is closed, but a buyer should still ask the association what repairs were actually made, whether the settlement covered them, and whether any related assessment was levied on owners. The building was also named in a 2024 University of Miami study that measured subsidence at 35 barrier-island high-rises, including Millennium; the study does not establish an immediate safety threat, and the City of Sunny Isles Beach has said it received no reports of settlement-related damage — but ask the association what it knows and whether any monitoring is in place.
• Owner-occupancy and financing. Lenders check the owner-occupancy ratio before approving a mortgage. No verified figure was found for this building. Confirm the current ratio with the association and talk to your lender early, before you fall for a residence.
• Rentals. This is a long-term rental building, not a short-term one. An MLS listing sheet for the building reports rentals allowed immediately, with a six-month minimum lease and association approval, plus a 1–2 week condo approval process with an interview and a $200 application fee per adult. Confirm the current lease rules, any rental caps, and the association approval process with the association before buying for income — and do not buy here expecting Airbnb-style income.
• Pets. An MLS listing sheet for the building allows two non-aggressive dogs or cats up to 25 pounds, plus household birds or fish. But an older pet-friendly directory lists Millennium as having no restrictions, while a rental listing for a unit here says No Pets for Renters. Those descriptions do not sit together cleanly. Confirm the current rules — including any size, number, or breed limits, and whether renters may keep pets at all — with the association before you buy if a pet is part of the plan.

Who this building suits

Millennium suits a buyer who wants a genuinely large oceanfront residence in a small, quiet building — at least 1,680 square feet, a private elevator into the foyer, four homes per floor, a heated oceanfront pool, tennis, and beach service downstairs — with a low monthly bill of about $0.88 per square foot, and who is comfortable doing real due diligence on a 27-year-old building: the milestone inspection, the reserves, and the settled 2016 construction-damage lawsuit. It is a poor fit for a buyer who wants a small or low-priced entry, a short-term rental, or a quick resale: the smallest residences are 1,680 square feet, the cheapest recent listing is about $1,399,000, leases run a six-month minimum, and only about one home in 36 changes hands in a typical year. It is also a poor fit for anyone who needs a firm pet answer from public sources — the size and renter rules conflict between sources and must be confirmed with the association. If you are choosing between this and another tower, send Mike the buildings you are comparing and he will walk through the finances with you, building by building.

Next step

Get the free Sunny Isles Beach Buyer's Building Guide — the ten questions to ask before you sign, applied to the tower you are actually considering. Or book a call with Mike to walk through Millennium together.