Cap rate compression is one of the most consequential — and most misunderstood — dynamics in commercial real estate pricing. When investor demand pushes property prices up faster than net operating income grows, cap rates fall. Falling cap rates mean buyers are accepting a lower yield in exchange for the same income stream, usually because they expect future NOI growth, lower interest rates, or simply because capital is chasing scarce assets.
The math is straightforward: cap rate equals NOI divided by value. Hold NOI constant, push value up, and the cap rate compresses. A property with a $1 million NOI traded at a 6% cap (worth $16.7M) becomes worth $20M at a 5% cap — even though nothing about the building changed. This is why cap rate compression is such a powerful return driver in strong markets, and why cap rate expansion is so painful in weak ones.
For underwriters, the practical question is whether to assume cap rate compression continues, holds steady, or reverses over the holding period. Most institutional models assume the exit cap rate is 25 to 75 basis points higher than the going-in cap — a deliberate cushion against the possibility that today's compressed cap rates won't last. That spread is often the single most important sensitivity in a DCF.
Cap rate compression also affects how lenders size loans. Higher property values support higher loan amounts at the same loan-to-value ratio, but lenders increasingly look at debt yield and debt service coverage instead — metrics that don't move with cap rate alone. Understanding when compression is real versus speculative is one of the most valuable skills in CRE analysis.
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