Strict temperature and humidity control — millions of years in the making.

SubTropolis houses 1.7 million square feet of government, archival, and record storage tenants who enjoy consistent climate control and 24/7 armed security.

SubTropolis’ limestone structure is six times stronger than concrete and naturally contributes to both temperature and humidity stability, establishing a consistent baseline for each measure year round. That makes it dramatically easier and more energy efficient to maintain specific ranges to best protect and preserve paper, film, photographs, stamps, and other sensitive materials.