Restaurant turnaround, big deal.
The best approach is under the radar. Unfortunately The Black Cat is not a foodie or even business savvy.
He wants to go in. He wants to be welcomed or at least not scowled at (in North America, anyway). He wants to see a clean, bright, airy, honest space and furnishings, and if any style, he'd pick modern. The Black Cat likes special seats, such as a window seat with a view. He likes pricing moderate to low, food great and staff prompt, especially when it comes time to present the check.
Distant memory of a start-up: Intersection coffee house run by AH of Coffee Cantata
A favorite: Rocky Point Lodge, Klamath Falls