For those that desire a true one-of-a-kind property, nothing compares to 735 18th Avenue NE. This stoic Mediterranean Revival Estate, commonly dubbed as the "Castle House," is nestled in the idyllic 18th Avenue corridor of St. Pete's Old Northeast neighborhood. Originally designed by the prominent 1920's builder, Samuel V. Schooley, known for artisan design and quality workmanship, the home now boasts 4 bedrooms plus an office in the main dwelling and a detached one bedroom and bath pool casita. You will feel like royalty as you approach the home flanked with restored wrought iron railings and juliet balconies calling you inside. Step in to see exquisite detail including the gleaming heart of pine wood floors, original picture ledges, many restored original windows and a nostalgic chime doorbell. The ultimate living room entertainment space, anchored by a beautiful hearth, opens up to a charming office library with natural light streaming from the floor-to-ceiling bay windows. Travel toward the rear of the home for a first floor bedroom with adjacent hall bathroom featuring a vessel bathtub perfect for a soak. Three additional, generously-sized bedrooms are located upstairs all with access to their respective bathroom or half bath. The surprisingly-large primary suite includes two spacious closets and a spa-like bathroom with a step-in frameless glass shower and a stand-alone bathtub for ultimate relaxation. Two more bedrooms are down the hall with another full hall bathroom and an en suite half bath in the front bedroom. Back to the main floor of the home, you will find a spacious dining room next to a stunning updated kitchen with modern elegance and fluid space to join others while cooking. Beyond the kitchen & interior utility room you will step out back to a sparkling saltwater pool surrounded by grounds which could easily host a garden party or special event. Adding to the entertainment, a detached pool casita is located in the backyard fully equipped with a kitchen, full bathroom and space that can be used for entertaining, office space or a true mother-in-law suite. Behind the casita is a one-car garage with additional parking pad space and a wide, paved alleyway. Calculated improvements have been made throughout the home and property: New upstairs AC unit, Fireplace damper and chimney cap, louvered plantation shutters in all bedrooms and baths, new AC in the casita, fencing and concrete wall extension to the rear yard. Many restored original windows and wrought iron accents have enabled this quintessential home to propel the romance of its era. Enjoy being steps away from waterfront walks, dining and entertainment of downtown St. Pete, private aviation at Albert Whitted Airport and quick access to two international airports.