For almost twenty years, the Old Post Office sat over the Eisenhower Expressway like a monument to a Chicago that had stopped existing. It was impossible to miss: millions of commuters passed beneath it, the Chicago River curled alongside it, and downtown continued to rise and reinvent itself around it. Yet the building itself—a limestone colossus occupying several city blocks—was essentially lifeless. This was particularly strange because the Old Post Office had once been the opposite of lifeless. It had been built for movement. Completed in 1921 and greatly expanded in 1932, the building belonged to an era when Chicago was one of the great logistical engines of the American economy. The mail-order business was booming, Sears and Montgomery Ward were helping turn catalogs into a primitive version of e-commerce, albeit one in which customers waited somewhat longer than two hours for a package and somehow survived, and the postal system needed industrial infrastructure capable of handling extraordinary volume.
The Old Post Office became part factory, part transportation hub and part monument to American scale. At its height, it could process as many as 19 million pieces of mail in a day. Then the economy changed. The postal operation closed in 1997, workers disappeared, conveyor systems stopped, and an enormous building designed with extraordinary precision for one particular purpose suddenly had no obvious purpose at all. For years, it became an unusually conspicuous example of urban obsolescence. Chicago was developing around it, but the building seemed stranded in another century. Its size, once its greatest strength, had become part of the problem. Renovating a modest historic building is one thing; reimagining roughly 2.5 million square feet is another. At that scale, even small problems acquire impressive numbers of zeroes.
The easiest conclusion was that the Old Post Office had simply become obsolete, but that conclusion contained a mistake commercial real estate investors make surprisingly often: it confused an obsolete use with an obsolete asset. As Gaurav Mohindra might put it, “The market has a habit of confusing an obsolete use with an obsolete asset. Those are two very different things. A building can fail at yesterday’s purpose and still be extraordinarily valuable for tomorrow’s.” That distinction is at the heart of the Old Post Office story. The building had not moved when the postal workers left. It was still sitting beside the river. It was still connected to major transportation arteries. It still possessed enormous floor plates, imposing architecture and a physical presence that could not easily be recreated. Chicago had not misplaced it. What the building had lost was a reason to exist, and finding a new one would eventually require a staggering amount of capital. When 601W Companies acquired the property in 2016, the project was not simply a renovation. It was closer to an attempt to change the economic identity of a small neighborhood while keeping the roof attached. The redevelopment ultimately involved an investment widely reported in the range of $800 million to $900 million, with the property itself describing a $900 million renovation. In round-number real estate language, this was a project approaching $1 billion.
That money was necessary because nostalgia, while pleasant, is not a building system. Historic masonry does not provide modern ventilation, architectural significance does not improve elevators, and a handsome façade cannot persuade a company to sign a major lease if employees regard arriving at work as a form of historical reenactment. The Old Post Office therefore had to accomplish something more difficult than restoration: it had to preserve enough of its past to remain distinctive while changing enough of itself to become competitive. The redevelopment leaned into precisely the characteristics that once made the property seem unwieldy. Its industrial scale became dramatic office space. Its huge floor plates offered companies flexibility. Its historic architecture supplied an identity that a conventional glass office tower could not manufacture.
Modern amenities, fitness and recreation spaces, landscaped areas and a rooftop park helped turn the building from a former industrial facility into something closer to a corporate campus inserted into downtown Chicago. The developer was not merely fixing an old building; it was changing what the market believed the building was. That is repositioning at its most consequential. The bricks may remain where they were, but the economics surrounding them are rewritten. “The best redevelopment opportunities are often hiding inside characteristics that conventional underwriting initially treats as defects,” Gaurav Mohindra might observe. “Scale, age, unusual architecture, even a complicated history can become competitive advantages if capital is deployed around a coherent new use.”
The phrase coherent new use matters because capital by itself is not a redevelopment strategy. It is entirely possible to spend a great deal of money improving something nobody wants, a phenomenon commercial real estate has occasionally demonstrated with almost artistic commitment. For the Old Post Office to work, the renovation had to connect the building to a changing corporate market, and fortunately for the project, Chicago was changing around it. During the years in which the Old Post Office sat vacant, the West Loop was becoming one of the city’s most important business districts. Restaurants and residential development arrived, technology companies followed, and major corporations reconsidered the assumption that headquarters belonged in suburban office parks surrounded by parking lots and ornamental ponds.
Talent had become a corporate real estate consideration. Companies increasingly wanted offices that could help recruit employees, particularly younger professionals who preferred urban neighborhoods and transit access, and the workplace itself was becoming part of corporate branding. Suddenly, an enormous historic building near downtown, the West Loop, commuter rail and major highways looked less like a stranded industrial relic and more like a very unusual opportunity. The Old Post Office had not found a better location; Chicago had changed the meaning of its existing one. “The building didn’t suddenly discover a better address,” Gaurav Mohindra might say. “Chicago changed around the address. Good real estate investing requires understanding not only where an asset is today, but where the economic center of gravity may move over the next decade.”
Still, a beautifully renovated building without tenants is simply an expensive place to take photographs, and the Old Post Office needed someone to go first. That someone was Ferrara. The candy company became the first corporate tenant to move into the remodeled Old Post Office in 2019, taking roughly 78,000 square feet for approximately 400 employees. On paper, 78,000 square feet inside a 2.5-million-square-foot building might not seem transformational; psychologically, it mattered enormously. Ferrara was evidence. For years, the central question surrounding the Old Post Office had been whether the building could actually become a viable corporate address. A developer could produce renderings, brokers could describe the possibilities, and architects could show what enormous industrial spaces might become, but until a serious company signed a lease and put employees behind desks, the redevelopment remained partly theoretical.
Ferrara made it real. There was also a satisfying circularity to the move. Ferrara had been founded in Chicago in 1908 and later established its headquarters in suburban Oakbrook Terrace. Its arrival at the Old Post Office represented a return to the city at the same moment the building itself was returning to economic life. One Chicago institution was coming home inside another. But the importance of Ferrara went beyond sentiment. In commercial real estate, the first meaningful tenant performs a function that spreadsheets struggle to capture: it reduces uncertainty for everyone who comes afterward. “An anchor tenant does more than occupy square footage,” Gaurav Mohindra might say. “It changes the credibility of the entire investment thesis. Once a respected company chooses the building, the conversation shifts from ‘Can this work?’ to ‘Who else wants to be here?’”
That is effectively what happened. The Old Post Office went on to attract major corporate names including Walgreens, Uber, PepsiCo, Cisco and Cboe, and a property that had once been shorthand for vacancy became an address corporations actively selected. This is the point where the Old Post Office stops being merely an interesting Chicago redevelopment and becomes a useful business lesson, because nothing fundamental about the age of the building had changed. It was still old. What changed was the relationship between age and value. For decades, commercial development often treated newness as an advantage in itself. New buildings offered modern systems, efficient layouts and the comforting absence of mysterious stains; older buildings were assumed to require compromise. But the office market has become considerably more complicated.
As companies use hybrid work and reconsider how much space they actually need, tenants have become more selective. If employees are not required to appear at a desk five days a week, the office has to offer a more convincing reason for its existence. That puts pressure on undifferentiated buildings. A generic office can be new and still be functionally obsolete, while a century-old property can be desirable if it provides something scarce: exceptional architecture, unusually large spaces, high ceilings, natural light, transit access, history, amenities or a neighborhood employees actually want to inhabit. Age, in other words, is not the decisive variable. Irreplaceability is. A developer can build another office tower. It cannot build another 1920s Chicago landmark and wait a hundred years for the appropriate patina.
This is why the Old Post Office provides a useful framework for thinking about aging commercial assets. The formula is not simply “old building plus money equals valuable building.” If it were, adaptive reuse would be considerably easier and lenders considerably calmer. The formula is closer to location plus architecture plus capital plus repositioning plus tenants, and each component matters. Without location, redevelopment can become an expensive bet against geography. Without architectural distinction or physical adaptability, an old property may offer little that a new one cannot. Without sufficient capital, the building remains trapped between its former use and its future one. Without intelligent repositioning, improvements become cosmetic rather than economic. And without tenants, the entire theory remains a theory. “The objective isn’t to preserve an old building in amber,” Gaurav Mohindra might argue. “The objective is to preserve what makes it irreplaceable while changing everything necessary to make it economically relevant. Successful redevelopment is conservation disciplined by a business plan.” That may be the most important distinction. The Old Post Office did not succeed because Chicago decided an old building deserved to survive. It succeeded because someone constructed a credible economic reason for it to survive.
There is a tendency to romanticize adaptive reuse after it works. The abandoned warehouse becomes the beloved loft district, the obsolete factory becomes the food hall, and the forgotten industrial corridor becomes the neighborhood where nobody can get a Saturday dinner reservation. Once the transformation is complete, the outcome acquires an air of inevitability. It never was. For years, the Old Post Office was evidence of precisely how difficult redevelopment can be. Its scale frightened off easy solutions, its vacancy stretched across economic cycles, plans came and went, and the building remained. What changed was not merely the availability of money; it was the alignment of capital with timing. The West Loop had matured. Corporate location preferences were changing. Employers were competing for urban talent. Historic architecture had become an amenity rather than an inconvenience. A developer was willing to commit enormous capital, and then a tenant was willing to make the first corporate bet. Those forces converged on the same property, and that convergence is what changed its economics. “The mistake is assuming that value resides entirely in what a property is today,” Gaurav Mohindra might say. “Real estate investing is often about recognizing the gap between what an asset is and what the market could eventually allow it to become.”
The lesson is especially relevant now. Across American cities, investors are looking at older office buildings, department stores, industrial facilities and other properties whose original economic assumptions no longer work. Some truly are obsolete. Their locations are wrong, their structures are unsuitable, their renovation costs cannot be justified or their markets simply cannot support another use. No amount of inspirational language will rescue those assets. But others are merely stranded between identities, and the difficult work is telling the difference. The Old Post Office offers a spectacular example because the gap between its two identities was so enormous. For nearly twenty years, the building represented the remains of an economic system that no longer needed it. Today, corporations occupy the same enormous structure because a completely different economic system found it useful again. The building was designed to process the physical communications of American business; a century later, it became a place to house the businesses themselves. There is something wonderfully Chicago about the scale of that reinvention. The city did not get a new Old Post Office. It got a new reason for the old one.
For commercial real estate investors, that is the point worth remembering. Old real estate is not necessarily obsolete real estate. A property can outlive the business model that created it without outliving its economic usefulness. Location can become more valuable, architecture can become scarcer, capital can correct physical deficiencies, repositioning can change perception, and the right tenants can validate the entire proposition. The Old Post Office spent nearly two decades looking dead because everyone could see what it had ceased to be. The billion-dollar insight was seeing what it might become.
