Rochester's Seneca Park Zoo is on the verge of its most significant transformation in decades. Monroe County has finalized the design for a $100 million capital project that will add a 48,000-square-foot Tropics Exhibit and a 22,000-square-foot Main Entry Plaza to the zoo's footprint along the Genesee River — and the county is now moving toward putting that work out to bid. Monroe County Executive Adam Bello announced in December 2024 that a $6.7 million design contract with CambridgeSeven was approved by the Monroe County Legislature by a 25–4 vote.

What Is Being Built

The project completes Phase Two of the Seneca Park Zoo Master Plan. Two new structures are planned on the front of the zoo property, where a previous building was already demolished:

• Tropics Exhibit (48,000 sq ft): A multi-level immersive facility housing a 150,000-gallon Pacific Reef Tank, indoor rainforest habitats, outdoor microclimates, and aquariums. Biomes will include Borneo Forest, Tropical Islands, and Pacific Reef Habitats. More than a dozen new animal species — including orangutan, Komodo dragon, clouded leopard, blacktip shark, and Sifaka — are planned for the exhibit.
• Main Entry Plaza (22,000 sq ft): A full replacement of the zoo's front entry infrastructure, including ticketing, membership offices, classroom and education space, event space, administrative offices, and a retail outlet.

Both structures are designed using sustainable materials and native plantings, with the aim of integrating the buildings into the Seneca Park and Monroe County Parks landscape. CambridgeSeven, the Boston-based firm selected to lead design, is known for major zoo and aquarium projects nationally.

Funding Split and Timeline

The $100 million project is funded through a three-way public-private partnership. Monroe County is contributing $34.5 million, Empire State Development has committed $42.5 million in state funds, and the Seneca Park Zoo Society is responsible for raising $23 million in private philanthropy. Funding for Monroe County's share was approved by the legislature in 2022.

Construction was initially targeted to begin in the first quarter of 2026. However, News10NBC reported in January 2025 that the original bid exceeded the budget by more than $50 million — prompting a redesign with CambridgeSeven before the project could return to bid. As of early 2026, the county is working to finalize the design and put the project back out to contractors. County Executive Bello's updated target is a completion date in late 2028 or early 2029.

Why This Matters to Construction Professionals

This is one of the largest publicly funded construction procurements on the horizon in the Rochester region. When Monroe County does release the formal bid, it will involve complex structural, mechanical, and specialty systems work — including a large marine exhibit with a 150,000-gallon saltwater tank, which carries significant waterproofing, structural loading, and life-support mechanical demands. The entry plaza rebuild also involves full site work, utility upgrades, and accessible design across an active county park. The fact that the first bid round came in $50 million over budget is a signal: the project carries real complexity, and contractors will need to approach it with careful scope review and escalation buffers.

General contractors, specialty aquarium/exhibit builders, mechanical and plumbing subs, and structural concrete firms should be watching this procurement closely. CambridgeSeven has envisioned a design that emphasizes integration with the park's natural landscape — meaning site work, grading, drainage, and landscape construction will be significant line items.

Implications for Owners, Developers, and Contractors

The budget bust on the first bid round is a cautionary tale that is relevant well beyond this project. In a construction market where labor and materials costs have risen sharply since 2022, early conceptual budgets established years ago are not reliable. Owners who anchored cost estimates during pre-design without continuous market validation are finding a wide gap when bids come in. Monroe County responded correctly — redesigning with a new firm and right-sizing the scope before going back to the market. That cycle costs time but protects against project failure at bid.

For subcontractors in the Rochester metro, a $100 million public construction project of this complexity typically represents several years of sustained subcontracting opportunity across MEP, specialty exhibit work, concrete, steel, roofing, glazing, and site work. The zoo's location within Seneca Park adds logistical constraints that will require coordinated staging and phased access to preserve park operations during construction.

What to Watch Next

• Monroe County's formal bid package and procurement schedule — the county must advertise the project publicly under New York State competitive bidding law.
• Confirmation of the revised construction budget and whether the $100 million ceiling holds given current materials pricing.
• The Seneca Park Zoo Society's fundraising progress toward its $23 million private commitment.
• Final site and environmental approvals, including any coordination with the Monroe County Parks system.

Bottom Line

Rochester's Seneca Park Zoo expansion is a major, complex public construction project that will generate substantial bidding activity when it reaches procurement. The project's history — a $50-million-plus bid overage followed by a redesign — illustrates how much the market has changed since the original budget was set. When the county does release a formal solicitation, contractors should be prepared for demanding specifications and a compressed schedule targeting a late-2028 opening. This is a project worth tracking now.

Sources

• Monroe County Executive Announcement — CambridgeSeven Design Contract Approved, December 2024
• Seneca Park Zoo — Tropics Complex Project Page
• CambridgeSeven — Project Announcement, February 2025
• News10NBC — Bid exceeded budget by $50M+, January 2025
• News10NBC — New Animal Species and Expansion Details, January 2025
• Planet Attractions — CambridgeSeven Selected, January 2025