OPEN HOUSE THIS SUNDAY BY APPOINTMENTS ONLY!!!!! Located in the heart of prime Center Park Slope, this elegant four-story brownstone offers nearly 3,100 square feet of interior space, plus a full basement, on one of the neighborhood's most coveted tree-lined blocks.  Rich in original detail and full of untapped potential, the property presents a rare opportunity to craft a truly custom residence or capitalize on a highly adaptable investment asset. Currently configured as a spacious two-bedroom, one-and-a-half-bath owner's duplex across the garden and parlor levels, the home also features two desirable rental units above: a full-floor, two-bedroom, one-bath apartment, and a bright, top-floor one-bedroom, one-bath.  With each unit offering generous proportions and excellent light, the building is well positioned to generate substantial rental income from day one. The property offers multiple pathways to customize, making it endlessly versatile. You might convert it into a stately single-family home with five or more bedrooms, create an owner's triplex with a garden-level rental, or maintain the current multi-unit layout to maximize income potential. For developers, the townhouse also presents an enticing opportunity for boutique condo conversion, particularly given its location on sought-after 4th Street. The setting places you just moments from Prospect Park, the weekend farmers market, and the shops and cafes of 7th Avenue and 5th Avenue. Whether you're an end user seeking a dream home to shape over time or an investor looking for a flexible, income-generating asset in one of Brooklyn's most beloved neighborhoods, this classic Park Slope townhouse delivers on both charm and possibility