Crafted by award-winning architect Roger Janssen and built by Beno Janssen III, this exquisite pre-construction residence, anticipated for completion Spring 2028, will stand as a rare architectural masterpiece in the heart of West Palm Beach's Old Northwood Historic District-at the prime corner of Spruce Avenue and 35th Street. Honoring the timeless Mediterranean Revival legacy of iconic architects John Volk and Gustav Maass, it blends elegant stucco facades, classic barrel-tile roofing, and arched entryways with refined Santa Barbara Modern interiors: clean lines, open-concept flow, vaulted ceilings, a dramatic circular staircase, star hall, and striking fireplace. Spanning 4,104 SF under air on this estate-sized 12,000 SF double lot with two separate addresses - a truly rare feature -, this property includes a 3BR/3.5BA main residence (3,552 SF A/C including 275 SF garage) and a detached 2BR/2BA guest quarters (552 SF), totaling 5 bedrooms and 5.5 baths. Enjoy the 15x30 ft heated pool, spa, lush landscaping, driveway, and optional carport. Old Northwood enchants with quiet, mature tree-lined streets and sidewalks. It features an exceptional collection of Florida Land Boom-era homes, preserved by the West Palm Beach Historic Preservation Board amid a vibrant revival driven by nearby multi-billion-dollar projects, to include the nearby Currie Park. Priced at $4,850,000-including a $150,000 allowance for minor customizations-this pre-construction opportunity delivers exceptional value at under $1,200/SF under air in one of South Florida's most promising historic-luxury enclaves. Note: Currently vacant fenced land with 8' closed-in berm, city-approved plans, double open permit for each address, 505 35th St and 3611 Spruce Ave; minor code enforcement lien pending resolution (lot maintenance during permitting, estimated <$17,000). Full disclosures available. ALSO: Located in a federally designated Opportunity Zone, offering potential significant capital gains tax deferral and exclusion benefits for qualified investors.