New Construction Projects in Marathon, Florida

Project 1: SeaGlass Cove

• Developer: Constellation Group (with Ironwood Venture Group)
• Location: 59720 Overseas Hwy, Grassy Key, FL 33050 (Marathon area)
• Type: Residential (luxury single-family homes)
• Units/Size: 14 homes (each ~4,800+ sq ft living/entertainment space, 4-5 bedrooms)
• Status: Recently Completed
• Expected Completion: Q2 2026 (first homes completed earlier; full community completion around mid-2026)
• Description: Gated oceanfront community of 14 three-story luxury homes on a 3.8-acre site with private beach, resort-style pool, pickleball courts, and short-term rental eligibility. Aimed at second-home buyers/investors.[1]

Project 2: Million Air Florida Keys FBO Building

• Developer: Million Air Florida Keys
• Location: Marathon International Airport (MTH), Marathon, FL
• Type: Commercial
• Units/Size: 5,460-square-foot building
• Status: Under Construction
• Expected Completion: End of 2026
• Description: New fixed-base operator (FBO) facility including a full-service restaurant and flight-planning space, representing ongoing investment in private aviation services at the airport.[2]

Limited public information available on additional multi-unit residential or mixed-use projects. Mentions of workforce housing redevelopment (e.g., 15 units associated with VC Seaview at 100 Avenue D) involve grants and existing developments but lack detailed public timelines or scale beyond redevelopment. Individual new single-family homes appear in listings but do not constitute larger announced projects. Infrastructure work (e.g., wastewater, drainage) is ongoing but not residential/commercial development projects. No other significant verifiable new construction projects matching the criteria were identified.