The Overton Exchange occupies the upper twelve floors of a Tier 3 commercial tower in the Lakeshore Corridor that was originally built as a Palladian Group financial services hub. When Palladian relocated its primary operations to the Spire in 2183, they sold the building's upper floors to a consortium of independent traders and left the lower floors as a combination of cut-rate office rental and a Carrion Logistics parcel hub. The upper floors were gutted, reconfigured, and opened as the Overton Exchange in 2185 — a physical trading floor in an era when most financial activity is conducted through Diaspora-linked BCIs. The Exchange's founding argument was that face-to-face trading, with all the social reading and physical presence that entails, produces better outcomes than pure BCI arbitrage. Fifteen years later, the argument has been vindicated enough that the Exchange processes a significant fraction of GLMZ's grey-market commodities trade.

The Exchange is not illegal. It operates under a carefully constructed Tier 3 municipal charter that regulates it as a 'physical commodities facilitation venue' and imposes a transaction tax that funds roughly a third of a specific sanitation district's operating budget, a fact that makes it politically untouchable by several Tier 3 council members. What trades across the Exchange floor is another question. Legitimate commodities — food futures, energy contracts, salvage lots — move alongside grey-market pharmaceutical supplies, unlicensed biotech, corponation intelligence packages, and the occasional synthetic person's labor contract in jurisdictions where such contracts are still legal. The Exchange's brokers do not ask what they're trading. They ask for the Φ and the handshake.

The physical floor itself is deliberately, almost aggressively anachronistic. Open-outcry trading, hand signals, physical contracts printed on paper and countersigned with ink. The Exchange's founders argued that BCI-mediated trading left too many backdoors for corponation surveillance and market manipulation. The physical format is a security feature. It is also, many observers have noted, genuinely exciting in a way that watching numbers move on a retinal display is not. The Exchange floor at peak hours is loud, physical, and kinetic — a deliberate performance of commerce that draws observers who have no intention of trading.