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.