MIAMI — A 100-story tower taking shape on Biscayne Boulevard is expected to become Florida’s first supertall building, adding a 1,049-foot landmark to downtown Miami’s skyline while intensifying questions about growth, transportation and housing affordability. The Waldorf Astoria Hotel & Residences Miami is a $1.2 billion development designed as nine glass cubes stacked at different angles. Construction is expected to be completed in the first quarter of 2028, with the 205-room hotel scheduled to open in the second quarter of that year. The residential portion will include 363 homes, ranging from one to four bedrooms. Christian Tupper, who is involved in the development, said 93% of the residences have been sold. Standard units are priced from $3 million to $11 million, while penthouses are listed at about $25 million; three of the eight penthouses remained available, he said. The homes are expected to accommodate about 1,300 people once occupied. The residences will be delivered finished, according to the development team. About 500 workers from construction company Moriarty are assigned to the project, with crews typically working six days a week. The tower was expected to reach its highest floor in roughly seven weeks from the Oct. 12 report. After that milestone, work will continue on the exterior glass and interior systems, including plumbing and electrical installations. Tupper said the impact-resistant glass panels are designed to withstand winds of up to 200 mph. The tower is part of downtown Miami’s shift toward a denser neighborhood with more residents alongside offices, businesses and cultural destinations. Michaeljohn Green, head of the Miami Downtown Development Authority, said employers in sectors including banking, finance and technology have contributed to demand for downtown housing. But the growth will require continued investment in mobility and infrastructure, Green said. Downtown’s options include Metromover, Tri-Rail, Brightline and Freebee, a local shuttle service funded by the authority. Green said getting more people to use those services and connecting neighborhoods will be important as the area grows. The project also highlights the divide between luxury development and the need for housing accessible to a wider range of incomes. Green said high land costs make it difficult to develop affordable housing in downtown, and called for officials to keep exploring funding approaches. He also pointed to wages that have not consistently kept pace with rising costs. Green said downtown’s future depends on balancing development with the needs of people already living in Miami. The Waldorf Astoria will join major destinations including Miami Worldcenter, Miami Dade College, Brickell City Centre, Pérez Art Museum Miami and Bayfront Park, he said. As the tower nears its upper floors, the project’s completion will bring more residents and a new hotel to the city center. Whether transportation links and housing opportunities keep pace with the skyline remains a central challenge for downtown’s growth.