Cap Rate Decompression
The quiet mechanism by which rising interest rates make buildings worth less, even when the rent checks never stop arriving.
Cap rate decompression describes what happens when cap rates rise across a market — the arithmetic term for a phenomenon that shows up in the real world as falling property values, even for buildings whose income hasn’t changed at all. Since cap rate equals net operating income divided by price, a rising cap rate with flat income can only mean one thing: price has fallen. Decompression is that fall, given a name.
The most common trigger is a change in the cost of money. Real estate competes for capital against other places an investor could park cash — government bonds, corporate debt, cash itself — and those alternatives get more attractive whenever central banks raise interest rates. If a ten-year government bond suddenly yields 4.5% with essentially no risk, a real estate investor is no longer willing to accept a 3.5% cap rate for a comparable amount of risk on a building — they’ll demand a higher return to compensate for taking on real estate’s extra uncertainty. Since the building’s income usually can’t rise fast enough to satisfy that new, higher required return, the only variable left to move is price. It falls until the ratio of income to price rises to a level investors find acceptable again. That adjustment — cap rates widening, prices falling — is decompression.
What makes decompression dangerous, particularly for anyone who bought near the top of a low-rate cycle, is that it can happen to a building that is, by every operational measure, performing exactly as expected. Occupancy might be stable. Rent collections might be on time. NOI might even be growing modestly. None of that protects the owner from the fact that the market’s required return has shifted, and their asset is now valued against a stricter standard than the one they bought into. This is precisely what happened across large parts of the global office market as rates rose through the 2020s: buildings with healthy, functioning tenancies still saw appraised values fall by double-digit percentages, purely because the discount rate applied to their income stream had climbed.
Decompression hits different property types with very different force, which is one reason real estate investors watch cap rate spreads sector by sector rather than treating “real estate” as a single asset class. Sectors seen as having durable, growing demand — data centers, logistics warehouses serving e-commerce — tend to see comparatively modest decompression, because buyers still believe strongly enough in future income growth to accept a smaller cap rate cushion. Sectors already facing structural doubt — offices contending with permanent hybrid work, aging retail facing further store closures — tend to see decompression amplified, because rising rates compound an already-souring narrative about the asset’s future rather than working against a stable one.
The inverse process, cap rate compression, is decompression’s mirror image: falling rates or improving sentiment pushing cap rates down and prices up, often faster than fundamentals alone would justify. Long stretches of compression, especially the historically unusual near-zero-rate years of the 2010s and early 2020s, are part of what set up the sharp decompression that followed once rates finally moved.
Nothing about a building has to change for its value to change. Sometimes the whole story is written in the cost of money elsewhere in the economy.