By Max Taves 

It is easy to underestimate the size of the Kansas City, Mo., industrial real-estate market. That's because a big chunk of it is hidden from sight--underground.

Occupying more than 21.8 million square feet, Kansas City's industrial underground space--80 to 150 feet deep, in former limestone mines--is the largest in the U.S., comprising more than 7% of the metropolitan area's total industrial area.

And demand for the space is growing, buoyed by resurgent manufacturing and expanding distribution centers seeking low-cost real estate requiring less energy to operate.

Next week, FoodServiceWarehouse.com, a restaurant-equipment supply company, will be moving into 475,000 square feet of space that sits more than 100 feet below the surface in a facility called SubTropolis, the largest underground industrial space in the U.S. Signed in May, FoodServiceWarehouse's lease was the largest by square feet--above or below ground--in all of Kansas City last quarter and the second-largest this year, according to real-estate data firm CoStar Group Inc.

"It's kind of what we call an underground city," says Ora Reynolds, president of SubTropolis owner Hunt Midwest Real Estate Development. SubTropolis has 8.2 miles of paved roads, 2.1 miles of railroad tracks, more than 500 truck docks, 1,600 parking spaces and 50 million square feet of space below ground. Its 6 million square feet of leasable space is fully occupied by 55 companies and their 1,600 employees.

Kansas City's conversion of old mines in the 1960s into usable industrial space represents the commercial-real-estate version of turning lemons into lemonade. Mining companies in the earlier part of the 20th century dug under layers of soil and shale for its abundant, 270-million-year-old deposits of limestone, leaving behind about 80 million square feet of space.

While the area experiences as much as 100-degree fluctuations between summer and winter, the underground offers a near-constant 65 degrees all year, according to broker Cassidy Turley's Whitney Kerr. The government was among the first and largest tenants, with those cool, dry conditions helping keep food from rotting and paper records from being damaged.

Constant temperatures means little need for heating and air conditioning. Those factors and lower tax rates have meant lower operating costs and lower rents. That has offered Kansas City's considerable industrial base, which includes large agricultural companies and two automobile factories--operated by General Motors Co. and Ford Motor Co.--an alternative, low-cost storage space, according to Mr. Kerr.

While the cost of leasing underground space has long been lower than aboveground space, the gap is narrowing. According to CoStar, the cost of aboveground industrial space in metropolitan Kansas City fell 1.7%, to an average of $3.99 a square foot in the 12-month period that ended in September. Underground space, meanwhile, rose 5% to $3.43. CoStar notes that underground vacancy rates have fallen three times faster than aboveground during the same time SHYperiod.

"You'd think it was a kind of primitive operation down underground, but it's proven quite resilient and adaptable to changing times," says Mr. Kerr of Cassidy Turley. According to Ms. Kerr, owners of underground space have begun upgrading their properties with more lights, modern ventilation and, increasingly, amenities geared toward luring technology-focused companies in need of computer storage and distribution space.

Longtime tenants such as government agencies and agricultural and pharmaceutical firms have found the cool, constant temperatures help provide useful places to store files, surplus crops and vaccines. But underground tenants increasingly include light manufacturers and e-commerce companies.

Demand has been so strong that both SubTropolis and competitor Meritex Enterprises Inc. are building additional space. After adding 1 million square feet of new space in the past year, SubTropolis plans to build another 750,000 square feet in the coming year. Meritex plans to add 80,000 square feet of speculative space by early next year. The company already has 2.4 million square feet of underground space.

Among Meritex's underground tenants is Priority Envelope, which employs 35 workers who print and manufacture envelopes. The company, which moved there in 2006, has no plans to move above the surface anytime soon. "We'll expand next year," says that company's president, Ryan Wenning. "It's just a matter of pouring concrete and building a wall. They paint the exposed rock white. It's a very fast process."

Write to us at DWEEK@WSJ.com

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