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$999,999
6 Days On Site

410 HASSENPLUG ROAD
MILLMONT, PA 17845

For Sale|Single Family Residence|Active
4
Beds
4
Total Baths
4
Full Baths
5,800
SqFt
$172
/SqFt
1969
Built
County:
UNION
Listing courtesy of RSR, REALTORS, LLC
Call Now: (703) 898-3565
Is this the listing for you? We can help make it yours.
(703) 898-3565
410 HASSENPLUG ROAD410 HASSENPLUG ROAD410 HASSENPLUG ROAD410 HASSENPLUG ROAD
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Monthly Payment (Est.)

$4,562
Calculator powered by Showcase IDX, a Constellation1 Company. Copyright ©2026 Information is deemed reliable but not guaranteed.

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.

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Listing Snapshot
Price 
$999,999
Days On Site 
6 Days
Bedrooms 
4
Inside Area (SqFt) 
5,800 sqft
Total Baths 
4
Full Baths 
4
Partial Baths 
N/A
Lot Size 
9.17 Acres
Year Built 
1969
MLS® Number 
PAUN2000880
Status 
Active
Property Tax 
$4,804
HOA/Condo/Coop Fees 
N/A
Sq Ft Source 
Estimated
Friends & Family
Recent Activity
6 days agoListing updated with changes from the MLS®
6 days agoListing first seen on site
General Features
Acres 
9.17
Attached Garage 
Yes
Foundation 
Concrete Perimeter
Garage 
Yes
Garage Spaces 
3
Levels 
Two
Parking 
OversizedGarageParking LotAttached
Parking Spaces 
3
Property Sub Type 
Single Family Residence
Security 
Security GateSecurity System
Sewer 
Septic Tank
Special Circumstances 
Standard
SqFt Above 
987
SqFt Below 
4813
SqFt Total 
5800
Style 
Other
Water Source 
Well
Zoning 
COMMERCIAL
Interior Features
Appliances 
Electric Water Heater
Basement 
Finished
Cooling 
Geothermal
Electric 
200+ Amp Service
Heating 
GeothermalHeat Pump
Interior 
Recessed Lighting
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Exterior Features
Construction Details 
Concrete
Fencing 
Barbed WireChain Link
Lot Features 
WoodedPrivateSecludedFew Trees
Pool Features 
None
View 
Mountain(s)
Waterview 
Mountain(s)
Community Features
MLS Area 
Hartley Twp (169005)
School District 
MIFFLINBURG AREA
Schools
School District
MIFFLINBURG AREA
Elementary School
Unknown
Middle School
Unknown
High School
Unknown
Listing courtesy of RSR, REALTORS, LLC



The real estate listing information is provided by Bright MLS is for the consumer's personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumer may be interested in purchasing. Any information relating to real estate for sale or lease referenced on this web site comes from the Internet Data Exchange (IDX) program of the Bright MLS. This web site references real estate listing(s) held by a brokerage firm other than the broker and/or agent who owns this web site. The accuracy of all information is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals. Properties in listings may have been sold or may no longer be available. The data contained herein is copyrighted by Bright MLS and is protected by all applicable copyright laws. Any unauthorized collection or dissemination of this information is in violation of copyright laws and is strictly prohibited. Copyright © 2020 Bright MLS. All rights reserved.

Neighborhood & Commute
Source: Walkscore
Disclosure: Community information and market data powered by Constellation Data Labs. Information is deemed reliable but not guaranteed.
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