What if downtown transit enters a death spiral?
An office-ridership transit death spiral degrades CBD viability and accelerates commercial property abandonment, feeding office-CMBS losses and big-city muni stress; trade short office REITs/CMBX and watch HY. Rhymes with the post-2020 urban-doom-loop fears that hit SL Green/Vornado and San Francisco's transit-fiscal cliff. Transmission runs through CMBS, regional banks with office exposure, and municipal budgets. Forward angle: this is the realized tail of the WFH shock, slow-moving as leases roll, so it is a grind-lower not a crash. Roots reasonable.
Every number ships with its receipt — the odds, the range, the precedents, and a public grade at Reality Check. The statistical machinery that produces it is proprietary.
The butterfly cascade
How this trigger trickles across markets, left → right — the root shock, its first‑order moves, then the ripple effects. Drag any node; tap a market for its real price history.
Resolution timeline — how this probability is moving
Our model's odds (electric blue) over time vs the market's (Polymarket, amber), from the past toward the 1–3 years horizon. Each dot is a real macro event that nudged the probability — green pushed it up, red pushed it down. Tap a dot for the source. Loading the probability audit trail…
What it would mean
If this plays out, it is a risk-off shock. Collapsing office ridership starves transit revenue, degrading service and accelerating CBD property abandonment. The trigger decomposes into signed root‑shocks — Credit spreads ▲ · Recession signal ▲ — which propagate through our causal graph to the markets below.