How Aston Martin’s owner is growing a profit-rich luxury car business

Lawrence Stroll and his British luxury performance brand, Aston Martin (AML.L), are planting a big flag in New York City — part of the billionaire’s continued quest to cater to the wealthy and produce eye-raising profit margins.

The automaker opened its Q New York boutique, its first flagship store, on 450 Park Avenue in New York City, a stone’s throw away from the iconic Plaza Hotel. The new location — with floor-to-ceiling “champagne” tinged windows, Italian marble…