Can you explain the "substantial expense" required to convert an office parking garage to a residential parking garage? Typically, office building parking rati

Can you explain the "substantial expense" required to convert an office parking garage to a residential parking garage? Typically, office building parking ratio is currently around 4 spots per 1,000 square feet (1). With two people sharing a 750 sqft 1BR apartment, there should be 50% extra parking spaces. (1) https://www.commercialrealestate.loans/commercial-real-estate-glossary/parking-ratio/ https://www.commercialrealestate.loans/commercial-real-estat...