The Belnord apartment building between Broadway and Amsterdam Avenue on 86th and 87th Streets will be getting a “very high-class Botox treatment” according to architect Robert A.M. Stern, who is behind the much hailed limestone building at 15 Central Park West  and now tapped to design the rental-to-condo conversion of 95 apartments. Stern’s designs, which were approved by the city’s Landmarks Preservation Commission, include reconfiguring apartment layouts and adding amenities like a gym and central air.

Developer HFZ Capital Group is aiming for a $1.35 billion sellout with plans to command $3,000 per square foot on average — among the highest-ever on the UWS. According to documents filed with the New York State Attorney General’s office, two-bedrooms will range from $4.4 million to $7.3 million. The priciest unit will be a seven-bedroom 5,093 square feet unit, asking $18.4 million (or $3,612 per square foot).