523 N Midland Avenue Rare 5.3-Acre Estate in Upper Nyack - A Unique Development or Dream Home Opportunity Discover a one-of-a-kind chance to own 5.3 acres of stunning, level, park-like property in highly sought-after Upper Nyack, complete with seasonal Hudson River views. This expansive parcel features a beautiful, historic stone wall bordering the front of the property and offers subdivision potential-approved for half acre lots, making it ideal for developers or those seeking a private estate with room to grow. The existing home has undergone major foundational upgrades, including brand-new footings and underground electrical wiring, along with new electric panels already installed. Completely restructured and resurfaced footings. New 8X10 space under the front porch. Larger window wells in the basement for more light. All underpinning for stairwell is complete. Renovated crawl space for moisture control. New electric service ready for whole house generator. New subfloors downstairs. Demo of all fireplaces ready for waterproofing and finishing. Demo of entire south side and brick work done to re-roof and close in space. The entire foundation of the house needed refirming and that work was completed. Town-approved architectural plans are included and feature luxurious details such as a master suite, music room, elevator, butler's pantry, screened-in porch. There is a detached two-car garage. Whether you're envisioning a private retreat or a development opportunity, this property combines natural beauty, valuable infrastructure, and exceptional potential-all just minutes from the river, village shops, and Nyack's vibrant lifestyle.