3427 16TH Avenue S Welcome to this beautifully renovated St. Petersburg home offering modern comfort, thoughtful upgrades, and exceptional flexibility. Fully updated in 2025, this move-in-ready residence features an open-concept layout, a designer kitchen with a large island, elegant stone finishes, and a bright, inviting living space perfect for everyday living and entertaining. One of the home's most unique features is the permitted second-floor living area, offering approximately 800 sq. ft. of additional flexible space with two bedrooms and a full bathroom. This private upper level creates endless possibilities - a guest suite, home office, creative studio, media room, playroom, or private retreat. Due to the distinctive roofline and ceiling design, portions of this level are not included in the official heated living square footage, but provide valuable usable space beyond the main living area. Major upgrades provide peace of mind, including a newer roof (2021), newer A/C system (2021), hurricane shutters (2024), professional fumigation (2026), and a new privacy fence (2026). Step outside to enjoy the fully enclosed backyard oasis featuring a built-in fire pit, creating the perfect setting for relaxing evenings and outdoor gatherings. With approximately 1, 952 sq. ft. of total usable space, this turnkey property combines St. Petersburg charm with modern upgrades and the flexibility today's buyers are looking for.