323 5th Avenue - 21.5ft Wide Prime Park Slope Mixed-Use with Retail & Duplex Residence Currently Zoned to PS 321 An exceptional opportunity in the heart of Park Slope, 323 5th Avenue offers a mixed-use building that combines stable commercial tenancy with a spacious duplex residence, encompassing approximately 2,851 square feet including the basement. Ground Floor & Lower Level A preschool currently occupies t he street-level retail storefront provid ing excellent frontage and visibility along bustling Fifth Avenue, benefitting from consistent neighborhood activity. A finished slab basement adds flexible space for storage or back-of-house operations. Tenant is in place through 20 31. Residential Duplex with Terrace currently zoned to PS 321 A newly renovated duplex apartment blends modern comfort with thoughtful design. Hardwood floors run throughout, complemented by double-pane insulated windows. The main level features expansive living and dining areas along with a modern, generously sized kitchen outfitted with updated appliances and ample counter space. The kitchen flows directly to a private terrace of approximately 400 square feet-an ideal setting for grilling, gardening, or outdoor entertaining. A convenient half bath completes this level. Upstairs, the primary suite includes a generous walk-in closet and a modern, upgraded en-suite bathroom. Two additional bedrooms share a second full bathroom, also updated with contemporary finishes. Building Upgrades The property was recently improved with new mechanicals, including two boilers and HVAC systems, providing efficiency and peace of mind for both residential and commercial use. Income / Expense set up available upon request Perfectly positioned near Prospect Park and surrounded by Park Slope's acclaimed restaurants, cafés, and shops, 323 5th Avenue combines commercial stability with desirable residential living in one of Brooklyn's most sought-after neighborhoods. The building also carries approximately 935 square feet of unused FAR; buyers are encouraged to consult with an architect or other professional regarding potential options.