I sat across from a developer once... sharp guy, good track record... and he told me his new convention hotel was going to "transform the city." I asked him what his stabilized occupancy assumption was. He changed the subject. That conversation was 15 years ago at a different project in a different city, and I can tell you exactly how it ended: the hotel opened late, stabilized slower than projected, and the city spent a decade wondering where the economic impact went.

Detroit's getting a 600-room JW Marriott connected by skybridge to the convention center. Nearly $400 million all-in. That's roughly $660,000 per key for a new-build luxury convention hotel, which honestly isn't outrageous for the product type... comparable convention properties in Nashville and Indianapolis have traded at similar levels. The $142 million in tax incentives underwriting the deal, though... that's where I want to slow down. That's a 30-year Renaissance Zone worth about $130 million plus another $11.6 million in abatements. The city's math says the hotel generates $25.4 million in annual tax revenue and $2.5 billion in economic impact over those 30 years. I've seen these projections before. The revenue number always assumes full stabilization by year three and consistent demand growth through year ten. Reality tends to be less cooperative.

Here's the thing... Detroit genuinely needs this hotel. The convention center has reportedly been losing 12 events a year because there wasn't an attached hotel. The NBA reportedly wouldn't bring an All-Star game without more rooms. The NCAA Final Four is booked for April 2027, essentially timed with the opening. That's real demand. That's not speculative. What concerns me is the supply math around it. Marcus & Millichap projected 1,200 new rooms hitting downtown Detroit, with occupancy expected to dip to 59% during the absorption period. The market's current ADR sits around $126. This JW Marriott is projecting an average rate of $345. That's a 174% premium to the market average. Even with the JW flag and the convention connection, that spread is aggressive. It assumes the hotel operates almost entirely outside the existing comp set, pulling demand that currently goes to other cities, not other Detroit hotels. That's the bet. And it might be right. But if convention bookings underperform those projections by even 15-20%, the flow-through math on a $400 million asset gets ugly fast.

The developer, Sterling Group, has already secured $252 million in financing through Ullico, the union labor insurance company. That's smart... union labor financing for a union-built hotel creates alignment. And they're already booking room blocks through 2029, which suggests genuine market confidence. But I've watched convention hotels in a half-dozen cities open with strong advance bookings and then struggle to fill the gaps between events. Convention demand is lumpy. You're sold out for three days, then you're running 45% for the next week. Your F&B operation (three restaurants, a spa, a 50-foot lap pool) has fixed costs that don't care whether there's a convention in-house or not. At $660K per key, the debt service alone demands consistent high-rate performance. The 30-year tax break helps the developer's return, but it doesn't help the operator fill Tuesday nights in February.

What I'll be watching is the gap between what the city was promised and what gets delivered. $2.5 billion in economic impact over 30 years is $83 million a year. That's a bold number for a single hotel, even a 600-room convention property. If the JW Marriott Detroit delivers 70% of that projection, the city probably still comes out ahead. If it delivers 50%, someone's going to be asking why $142 million in tax breaks went to a hotel that generates less revenue than promised. That's the math that matters... not whether the hotel opens (it will), not whether it's beautiful (it will be), but whether the economic assumptions that justified $142 million in public money hold up when the projection meets a Tuesday night in January with no convention on the books.