A buyer has reportedly paid $61 million for an apartment perched in one of Hong Kong's loftiest neighborhoods, setting another stunning record in a city already known for its sky-high prices.

The apartment sold is situated on the city's Peak and is part of architect Frank Gehry's first creation in Asia, the Opus. The building, which was completed in March, has an undulating glass facade that curves and offers each floor a distinct vista of the surrounding leafy environs. Last year, project developer Swire Properties' chief...