Here is a number worth sitting with for a moment: according to research by SMR Research Corporation, the average age of US commercial buildings at the end of 2021 was approximately 53 years. Similar studies in 2011, 2014, and 2017 put that average at around 50. Since 2018, that number has been creeping upward.

According to the U.S. Department of Education, the average school building is 49 years old.

What does that mean in practice? It means that a very large percentage of the facilities that school districts, municipalities, universities, and public sector organizations manage every day are entering – or already deep into – the most complex, most expensive, and least predictable phase of their useful life.

And many of the people responsible for managing those buildings are encountering these challenges for the first time.

Buildings Age Like People

There’s a useful analogy here. Buildings age the way people do – each decade brings a different set of issues and risks, and the challenges that emerge in the fourth and fifth decades are fundamentally different from anything that came before.

In the first ten years, building owners are typically lulled to sleep. Buildings require little to no significant maintenance. Cosmetic issues – painting, caulking, carpet replacement – are about as serious as it gets.

In the second decade, the first major systems begin to reach end-of-life. Roofing, HVAC equipment, pavement, water heaters, pumps and valves – systems with roughly 20-year replacement cycles – start demanding attention. This is the decade that surprises a lot of building owners who haven’t been planning for it.

The third and fourth decades layer on additional complexity. Doors, windows, and cabinetry follow 25-to-30-year replacement cycles. Control systems for elevators, fire alarm panels, and HVAC equipment require replacement. ADA conformance, triggered by renovation activity, starts to enter the picture. Code compliance, energy performance requirements, and structural considerations all begin to intensify.

The 40-60 Year Threshold

It’s in the fifth and sixth decades – years 40 through 60 – that buildings enter what Roth IAMS calls the renovation phase. This is where the real complexity lives, and it’s where a lot of organizations are right now.

In these decades, hidden systems start to emerge for study and maintenance. Plumbing, electrical, elevator infrastructure, fire alarm systems, and building facades – the systems that run through the walls and ceilings and have been largely invisible for a generation – begin to require serious attention. Major renovation becomes necessary, not just cosmetic remodeling.

What makes this phase uniquely challenging is the compounding effect. A second cycle of doors and windows arrives. A fourth cycle of remodeling. And for the first time, a first cycle of comprehensive renovation – involving the hidden infrastructure that was out of sight and out of mind during all of the earlier work.

The renovation decisions made at this stage also trigger a cascade of compliance requirements. ADA conformance, energy code compliance, seismic bracing requirements (depending on location), and fire safety upgrades that weren’t required when the building was originally constructed all come into play when significant renovation work is undertaken.

The Red Flag Generation

There is an additional layer of complexity for buildings constructed in the 1970s specifically. Lead-based paint and asbestos were outlawed in 1978 and 1979, but buildings constructed before those dates contain both, and any significant renovation work triggers the costs of remediation.

Plumbing systems using galvanized and polybutylene piping – both problematic and short-lived – are prevalent in buildings of this era. Electrical panels manufactured by Federal Pacific and Zinsco were installed widely and are known to be failure-prone. Aluminum wiring, used as an inexpensive alternative to copper during this period, creates fire risk. Buildings of this age are also typically short on fire safety systems and may not be adequately braced for wind or seismic activity.

For facility managers inheriting portfolios with significant 1970s-era construction, the risks aren’t just about age. They’re about a specific generation of building practices and materials that create a known and identifiable set of problems.

What This Means for Your Capital Plan

Buildings have a predictable cycle of capital investment. Understanding where each building in your portfolio sits within that cycle is foundational to building a capital plan that reflects reality.

Painting and carpeting run on a 10-year cycle. Remodeling on a 15-year cycle. HVAC, roofing, control systems, and pavement follow a 20-year cycle. Doors, windows, and cabinetry follow a 25-to-30-year cycle. Major renovation of hidden infrastructure — the work that dominates the 40-60 year window – adds a layer that many capital plans underestimate or miss entirely.

A Facility Condition Assessment done properly captures where every system in a building sits within these cycles. It documents not just what needs attention now, but what is coming – and when. That forward visibility is what allows facility managers to plan proactively rather than react expensively.

The other dimension that aging portfolios make urgent is the question of investment versus divestment. As buildings cross the 50-60 year threshold, the question of whether continued capital investment makes sense needs to be answered honestly. If capital investment has been consistently deferred, the extent of renovation required may become too extensive to consider for the current use, and adaptive reuse, consolidation, or other major changes may be the more appropriate path.

That is not a conclusion to arrive at emotionally or politically. It’s a conclusion that requires good data – condition ratings, replacement cost estimates, utilization information, and a clear-eyed view of what the building’s future role in the portfolio actually is.

The Bottom Line

The buildings that public sector organizations manage are aging. That trend is not reversing. The facility managers who understand the risks associated with each phase of a building’s lifecycle – and who have the data to plan around those risks – are in a fundamentally better position than those who are discovering them one emergency at a time.

If your portfolio has significant stock in the 40-60 year range, now is the time to understand what’s actually in those buildings, what’s coming, and what it’s going to cost. That knowledge is the foundation of every other conversation you’ll have about capital investment, funding, and the long-term stewardship of the assets in your care.