How much did the Van Der Woodsen Penthouse

how much did the Van Der Woodsen penthouse cost, its deffo expensive but not as expensive as blair's probably to originally buy but it is said that Lily renovates it so that would increase the price so what estimate do you guys think it's worth to purchase and how much it was to renovate? the apartment building is located in Midtown East and Midtown east Penthouses are quite expensive and it says that irl the penthouse is worth nearly 7 million