Other than flyovers by the occasional drone or maybe a high-flying bird or 2, there aren’t too many privacy breaches that might threaten the penthouse level of Bayou Bend Towers, a tony, 1981 condoplex. A 3-level unit — featuring an expansive rooftop terrace and cushy private poolscape (top) — arrived on the market a week ago with an asking price just shy of $5 million. Showings won’t begin until after the holiday weekend, but here’s a preview of the palace-like place and its 180-degree views that sweep from downtown, over River Oaks (and its golf course), to the Galleria: