Paxton Mosaic Campus
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Building description
Paxton Mosaic Campus is one of the most historically significant properties in Northern Virginia. Constructed in 1872 for Pennsylvania industrialist Charles R. Paxton, the estate is anchored by Carlheim Manor, a nearly 17,400 square foot, 32-room Second Empire mansion designed by New York architect Henry Dudley and listed on the National Register of Historic Places since 1979. Set on approximately 16.9 acres in the northeast quadrant of Leesburg, the campus includes multiple structures and buildings comprising approximately 26,330 square feet of improved building area, set among gently rolling grounds with mature tree canopy, open lawn, and a unique system of underground caves.
In accordance with Rachel Paxton's will, the estate has operated continuously as a non-profit corporation serving children in need since 1921. The Margaret Paxton Memorial for Convalescent Children is now seeking mission-aligned tenants for the Paxton Mosaic Campus. Qualified nonprofit organizations may be offered little to no base rent in exchange for full NNN responsibility and a commitment to meaningful capital improvements to their leased space. For-profit tenants are required to pay market base rent in addition to all NNN obligations. All tenants must maintain a minimum of 75% of program participants qualifying as children in need under the Trust's guidelines.
The campus is well-suited for a range of child-focused programs including early childhood education, daycare, behavioral health, speech and occupational therapy, vocational training, and adaptive recreation. Each of the seven structures on the campus offers a distinct footprint and character, creating flexibility for multiple concurrent tenants operating complementary programs.
The property is located within minutes of downtown Leesburg, US Route 15, East Market Street, and Inova Loudoun Hospital, approximately 35 miles from Washington, D.C. and 10 miles from Dulles International Airport. Loudoun County is consistently ranked among the wealthiest and fastest-growing counties in the United States, with a population that has grown 29% since 2010 and over 95,000 children under the age of 15. Demand for quality child-focused services in this market continues to outpace available supply, making the Paxton Mosaic Campus a genuinely irreplaceable opportunity for the right operator.
Building highlights
- Nationally registered historic asset — Carlheim Manor is a 32-room, nearly 17,400 SF Second Empire mansion constructed in 1872 and listed on the National Register of Historic Places since 1979 (Carlheim Mansion not for lease)
- 16.9-acre campus in the heart of Leesburg with mature tree canopy, open lawn, underground cave systems, and approximately 26,330 SF of existing improved building area across multiple structures
- 100-year mission legacy serving children in need, providing prospective tenants an established platform with deep community roots and institutional credibility that cannot be replicated
- Flexible lease structure for nonprofits and for-profits — qualifying nonprofit tenants may negotiate little to no base rent in exchange for full NNN responsibility and a commitment to capital improvements
- Broad eligible use types including early childhood education, daycare, behavioral health, speech and occupational therapy, vocational training, and adaptive recreation
- Premier Loudoun County location — one of the wealthiest and fastest-growing counties in the United States, with over 95,000 children under 15 and documented demand for quality child-focused services that consistently outpaces available supply
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