Historic buildings help shape the identities of communities. More than the property of a single individual or company, they are tangible connections to a shared past. Beyond their historic value, older buildings also hold tremendous value hidden within the durable materials with which they were constructed. Stone, brick and even timber can remain in use for centuries when properly cared for and protected from the elements. These are structures that were built to last. 

Unfortunately, the Hudson Valley has recently endured compounding challenges that include deindustrialization, population decline, reduced tax bases and disinvestment. While some small towns have successfully bounced back and seen significant reinvestment and population growth, others have continued to struggle and many of their historic buildings are now in danger of demolition by neglect.   

The loss of individual buildings is unfortunate, but the real tragedy is that widespread dereliction puts entire communities and their histories in jeopardy. The challenge is not whether they should be saved—it’s how to bring them back in a way that makes them healthy, efficient and responsive to the evolving needs of the community. 

This is where adaptive reuse and deep energy retrofits come in. Instead of demolishing history, these approaches reimagine it—preserving character while dramatically improving performance.

Defining adaptive reuse and deep energy retrofits

The concept behind adaptive reuse is simple: repurpose historic buildings that have outlived their initial function rather than demolish them. In most cases, the core elements of the building (its foundation, walls, flooring, ceilings, etc.) remain in place or are salvaged, and the building enjoys a second life that is more aligned with the updated needs of the community.

While historic buildings were designed for longevity, they typically weren’t designed for efficiency. Deep energy retrofits enhance these buildings’ performance through the five principles of Passive House design, which include continuous insulation, airtight construction, high-performance windows, elimination of thermal bridges and balanced ventilation with heat recovery. 

The transformation turns drafty and inefficient older structures into durable, low-energy buildings that reduce utility bills while delivering exceptional comfort and indoor air quality. The combination of airtightness and mechanical ventilation ensures those inside receive a continuous supply of fresh and filtered air free of dust, pollen and other allergens. Meanwhile, the reduction in energy demands allows for smaller, all-electric systems to replace bulky furnaces and boilers. 

When the benefits of adaptive reuse are combined with deep energy retrofits, the results can be transformative at the community level. 

Spotlight on William Street

A clear example of this approach is unfolding on William Street in Newburgh, NY. Led by the Newburgh-based nonprofit Safe Harbors on the Hudson and developers BronxPro Group, the team is breathing new life into a street that has numerous vacant properties and historic structures that have been abandoned or underutilized for years.

The centerpiece of the development is 77 William St., which is a new five-story building with 46 units of affordable and supportive housing designed by Curtis + Ginsberg Architects (C+GA). Flanking 77 William are two multifamily properties that are currently vacant. They will receive a deep energy retrofit and create nine additional units of affordable housing. Though structurally distinct, C+GA notes that the three buildings will be socially integrated and share a backyard, a laundry room and an event space on the ground floor of 77 William.

The design team faced a familiar challenge in legacy cities: how to meet stringent energy targets within buildings that were designed in another time and include masonry party walls, irregular framing and aging structural elements. To enhance performance, they will perform extensive air sealing, add insulation, restore the façade, and install high-performance windows that respect the historic character of the street. Mechanical systems will be right-sized to match the dramatically reduced heating and cooling loads. 

The new construction at 77 William complements this work. Built to achieve Passive House certification through Phius, it demonstrates what contemporary infill can look like in a historic context: contextual in scale and materials, but uncompromising in energy efficiency. Together, the new and rehabilitated buildings illustrate that high-performance buildings can be deployed in communities that stand to benefit most from lower operating costs and healthier housing.

Benefits beyond housing

Importantly, projects like this are not just technical exercises. They require coordination among architects, engineers, contractors and tradespeople who understand airtight construction, thermal bridge mitigation and high-performance detailing. In a city like Newburgh, that translates into local work. These are jobs that cannot be outsourced. Air sealing must be done on site. High-performance windows must be installed by trained professionals. Skill is required to do these kinds of jobs, and those who can do it with speed and precision will be well paid. 

As the building industry increasingly shifts toward higher energy standards and electrification, the demand for skilled labor will only grow. Training local tradespeople to execute deep energy retrofits gives them a competitive edge in a market that is rapidly evolving. The skills developed on one project become the foundation for the next.

Seen in this light, the project on William Street is a prototype for how vacant or distressed properties across the Hudson Valley might be reimagined: not as liabilities, but as platforms for climate resilience and engines for economic development and community stabilization.

Jay Fox is a writer and senior editor for Passive House Accelerator. He currently lives in Asheville, NC.