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4 Beds
4 Baths
5,800 sqft

$999,999

410 HASSENPLUG ROAD, MILLMONT PA, 17845

Price per sqft$172.41
Built in1969
Property size5,800 sqft
Property typeResidential

Overview

Active

Active-bright

Listed Sep 7, 2026

Updated 5 days ago

Exceptionally rare opportunity to acquire a Cold War-era underground communications facility, originally constructed between 1967 and 1971 as part of AT&T’s Long Lines network and engineered for durability, redundancy, and long-term self-sufficiency. The property features an approximately 4,813-square-foot below-grade reinforced concrete bunker beneath a 987-square-foot, four-car concrete block garage. The bunker is configured with multiple secured rooms, hardened corridors, mechanical and utility areas, a generator room, decontamination room, full kitchen, and four bathrooms. An elevator connects the above-grade garage to the underground facility, while copper screening within several interior partitions provides additional electromagnetic attenuation. The facility underwent extensive renovations in the early 2000s to support its potential use as a secure data and communications center. These improvements included updates to the electrical distribution, mechanical systems, and interior spaces for sensitive equipment and long-duration operations. Power infrastructure includes commercial electric service with automatic transfer capability and a 150 kVA diesel generator supported by approximately 2,500 gallons of on-site fuel storage. Heating and cooling are provided by multiple geothermal heat pumps served by four reported geothermal wells approximately 300 feet deep. Water infrastructure includes a separate potable well reported to be approximately 125 feet deep, a 1,500-gallon fresh-water storage tank, water filtration, and an on-site septic system. The facility also incorporates multi-stage air filtration designed to support extended below-grade occupancy. Situated on approximately 9.17 private acres, the property features a high gated perimeter fence, controlled entrance, substantial setbacks, and a discreet, low-profile footprint. The property is located in Flood Zone X and is currently zoned Agricultural Preservation. The existing commercial use has been identified in the appraisal as a pre-existing grandfathered use. Potential applications include a secure private compound, data center or server facility, continuity-of-operations site, research facility, specialized storage, or other approved uses. Due to the unique and sensitive nature of the property, certain information is available only to qualified prospective purchasers. Showings by appointment only. Proof of funds required. All proposed uses, system capacities, operating conditions, zoning, and measurements should be independently verified.

$6,653/mo

Est. mortgage payment based on a $999,999 home price.

All estimates are provided by Luxury Presence for informational purposes only. Actual amounts may vary.

Additional information

MLS® ID
PAUN2000880

Interior Features

Bedrooms
4
Bathrooms
4
Heating
Yes
Basement
Yes

Exterior Features

Lot Size
9.17 Acres

Other Property Details

Taxes
$4,804
Tax Frequency
Annually
Garage
Yes
View
Yes
55+/Senior Community
No
MLS provider logo

Listed by RSR, REALTORS, LLC
Listing Contact: 7176456418 

The IDX display contains information sourced from the Bright MLS, Inc. as of 10/2/2026. This data is intended solely for personal, non-commercial use and is not to be utilized for any other purposes except to identify potential properties for purchase. Although the MLS data displayed is typically considered reliable, it is not guaranteed to be accurate by the MLS. Buyers are responsible for verifying the accuracy of all information and are advised to conduct their own investigations or seek professional assistance. Other sources besides the Listing Agent may have contributed to the MLS data presented. Unless expressly specified in writing, the Broker/Agent has not confirmed any information obtained from external sources. The Broker/Agent may or may not have acted as the Listing and/or Selling Agent and cannot guarantee the accuracy of property locations displayed on any map. Any compensation offers are solely made to participants of the MLS where the listing is registered.

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Data last updated on 10/2/2026 at 12:42 AM UTC

 

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