Kolter, Altman's Alton Biscayne Lands Its Big Building Permit

A second $28 million building permit went active this month on the North Miami parcel where a joint venture of Kolter Multifamily, Carlyle Group and The Altman Companies is building Alton Biscayne, a 336-unit apartment tower. Miami-Dade’s permit wire shows permit 2026063242 issued August 6, with Kast Construction Company Florida LLC as contractor, the same firm named as general contractor when construction on the project began last November.

This is not the permit AmDev covered at the July groundbreaking. That story rested on permit 2026056763, issued July 8 to All American Windows and Doors LLC, a specialty trade contractor. Both permits carry the identical $28 million figure because Miami-Dade’s system repeats a project’s total declared job value across every permit tied to the same site, not because they are the same filing. This one belongs to Kast, the general contractor, and is the first permit at the address issued in Kast’s name.

Why it matters

The permit wire’s own developer field misattributes the filing to Bianca Investments LLC, the entity that sold the 3.23-acre site. Bianca, managed by Alejandro Silberman, closed on the $15 million sale of 11240 Biscayne Boulevard to the Kolter-Altman-Carlyle venture in November 2025, according to Commercial Observer and Kolter’s own release, and has no remaining stake in the project. A general contractor’s own building permit, as opposed to a trade sub-permit, is the stronger signal developers use to gauge whether a competitor’s project is actually pouring concrete or still stuck in financing.

The numbers

Alton Biscayne is planned as a 12-story, 336-unit residential building with a standalone 7-story parking garage and eight townhome flats along the western property line, per Florida YIMBY and Kolter’s own release. Of the 336 units, 71 are designated workforce housing. The JV secured an $86.1 million construction loan from PNC Bank around the same time it closed on the land. Amenities include a rooftop deck, a golf simulator and two clubhouses totaling roughly 7,300 square feet. Completion is targeted for 2027. The property sits in the Biscayne Shores area of unincorporated North Miami, along Miami’s Biscayne Boulevard corridor roughly nine miles north of downtown.

What’s next

The active $28 million permit suggests vertical work is ramping past foundations, though the county’s own record for that filing carries square footage and unit figures too internally inconsistent to quote. Watch for Miami-Dade to correct the permit’s developer-of-record field to the Kolter JV, and for the next construction-loan draw or topping-out milestone as the marker of real progress on one of the last large development sites on this stretch of Biscayne Boulevard.