A truly one-of-a-kind St. Petersburg home, distinguished by full solid block construction—including the second story—an extremely rare feature that offers exceptional durability and long-term structural confidence. Located at 4701 3rd Avenue South, this corner-lot property with alley access enjoys uncommon separation from neighboring homes, creating a quieter and more private setting than typically found in the area. The home sits on historic brick streets with granite curbs, a rare and irreplaceable streetscape that reflects the character and craftsmanship of old St. Pete. The property is situated on higher ground and historically dry, offering added peace of mind for flood considerations. The home is less than 10 minutes to downtown St. Petersburg, roughly the same distance to the beaches, and just three blocks from the SunRunner, offering direct, car-free access to both downtown and the beaches. Inside, the living room features heart-of-pine floors, decorative beams, and a full-size, real wood-burning fireplace, creating a warm and authentic centerpiece. Much of the downstairs is finished with Saltillo/Mexican tile, while oak flooring is featured upstairs. Numerous upgrades have been completed over time, including a full remodel of the downstairs bathrooms. The primary bathroom includes a jetted tub. A highly flexible highlight of the home is the separate in-law suite with private entrance, which can be easily converted back into a single large residence for an extended or multi-generational family, or continued as an income-producing space. The suite currently generates approximately $2,000 per month in rental income, with opportunity to increase rents. It features its own large, fully fenced private courtyard and deck, ideal for grilling, outdoor dining, pets, or secure private outdoor living. The upstairs residence is served by its own dedicated central air conditioning system, less than two years old and highly efficient, while the downstairs system has been recently updated, providing comfort, redundancy, and operational efficiency. The home is fully landscaped and equipped with a complete Bluetooth-controlled irrigation system. The upstairs residence benefits from its own separate parking area. The property also includes an architecturally compatible tool shed designed to mirror the look and character of the main home. Additional peace of mind is provided by a quality architectural shingle roof with recent roofing inspections documented. Rare construction. Rare streetscape. Rare flexibility. Homes with this level of construction, character, and versatility rarely come to market. Don't let this one slip away, schedule your showing today!