St Regis Sunny Isles South Tower Foundation Complete

The St Regis Sunny Isles south tower reached its first major construction milestone this summer. Between July 24 and July 26, 2026, Coastal Construction poured the tower’s mat foundation at 18801 Collins Avenue in one continuous three-day operation, and the developers announced the foundation complete on August 1.

The St Regis Sunny Isles South Tower Pour by the Numbers

• About 10,000 cubic yards of concrete
• About 4 million pounds of reinforcing steel
• More than 1,100 concrete truck deliveries
• About 500 workers on site
• Six boom pumps running at the same time for more than 30 hours
• A mat roughly 150 feet by 135 feet and 13 feet thick

A mat foundation of this size spreads the weight of a 62-story, 750-foot tower across the site. A continuous pour avoids cold joints, which is why crews worked around the clock rather than in stages.

What Happens Next

With the foundation done, the St Regis Sunny Isles south tower moves into vertical construction later in 2026, the phase when the building starts to rise floor by floor. Completion is targeted for late 2028. The north tower is scheduled to break ground in early fourth quarter 2026, with delivery expected in late 2029.

Fortune International Group CEO Edgardo Defortuna called the foundation one of the moments that marks the start of the tower’s rise, and Château Group CEO Manuel Grosskopf said construction is entering a highly visible phase. Coastal Construction co-CEO Tom Murphy pointed to continued demand for luxury waterfront homes in South Florida.

Why It Matters to Buyers

For buyers, foundation completion reduces one of the biggest early risks in pre-construction: getting a large tower out of the ground. It also starts the clock that most contracts tie to closing. If you are weighing a south tower resale or one of the last remaining homes, this is a good moment to review the current prices and the deposit schedule.

Remaining residences start at about $5 million. Our team tracks construction progress at St Regis Sunny Isles and at nearby branded towers such as St. Regis Residences Bahia Mar.

How a Mat Foundation Supports a 62-Story Oceanfront Tower

Sunny Isles Beach sits on a barrier island, so the soil close to the surface is sandy and the water table is high. Tall towers here rely on deep piles driven or drilled into firmer rock below, capped by a thick concrete mat that ties every pile together. The mat acts like a giant raft: it spreads the load of the columns, slabs and facade evenly so the building settles uniformly over time instead of in one corner.

Pouring that mat in a single continuous operation matters because concrete cures as it sets. If crews stop and restart, the boundary between old and new concrete becomes a weaker plane. Running six pumps through the night kept the concrete fresh across the whole slab, and the mix was designed to control heat as it cured, which is a common challenge with very thick pours in Florida’s summer temperatures.

St Regis Sunny Isles South Tower Construction Timeline

• 2022: sales launch for the St Regis Sunny Isles south tower
• July 24 to 26, 2026: continuous mat foundation pour
• August 1, 2026: developers announce the foundation complete
• Later in 2026: vertical construction begins, with the core and floors rising in sequence
• Late 2028: targeted completion and closings

Once vertical work starts, high-rise towers in South Florida commonly add floors on a repeating cycle of several days per level after the podium is finished. Weather, hurricane season and inspections all affect the pace, so dates in any construction schedule should be treated as targets rather than guarantees.

Signs to Watch as the Tower Rises

Buyers following the St Regis Sunny Isles south tower can track a few public markers: the tower cranes going up, the podium and parking levels taking shape, the building core climbing above the floors, and later the curtain wall glass being installed from the bottom up. Each one reduces the remaining construction risk and brings the closing date into sharper focus.

Our team shares construction photos and developer updates with clients as they are released, so buyers abroad can follow progress without visiting the site.

Who Is Building the St Regis Sunny Isles South Tower

The project team has deep experience with oceanfront high-rises. Fortune International Group, led by Edgardo Defortuna, has developed luxury towers across South Florida for decades, and Château Group, led by Manuel Grosskopf, brings its own record of Sunny Isles Beach buildings. Coastal Construction, the general contractor, has built many of the tallest residential towers in the region. Arquitectonica designed the architecture, and Anastassiadis designed the interiors.

That combination matters for buyers because large oceanfront projects depend on contractors who know local soil conditions, hurricane wind loads and the Miami-Dade permitting process. A smooth foundation pour is an early sign that the team is executing to plan.

What Buyers Should Do Now

If you already own a contract in the St Regis Sunny Isles south tower, this is a good time to review your deposit dates and begin conversations with lenders about the closing balance, since 2028 will arrive faster than it seems. If you are still deciding, ask our team which south tower residences remain and how their timing compares with the north tower, so you can choose based on when you want to move in.

Frequently Asked Questions

When will the St Regis Sunny Isles south tower be finished?

The developers are targeting completion in late 2028. Closing dates depend on the certificate of occupancy, so confirm current timing with our team before you plan financing.

Can I still buy in the St Regis Sunny Isles south tower?

A small number of residences remain, and resales or contract assignments can come up. Call our team for what is available this week.

Does foundation completion change my deposit schedule?

No. Deposits follow the dates in your purchase contract, not construction milestones. Review the schedule on our deposits page or ask our team.

The St. Regis Residences, Sunny Isles Beach are not owned, developed or sold by Marriott International, Inc. or its affiliates. Oral representations cannot be relied upon as correctly stating the representations of the developer; refer to the documents required by Section 718.503, Florida Statutes. Prices and availability are subject to change.