410 Hassenplug Road

Active

$999,999

4 beds4 baths5,800 sqft

410 Hassenplug Rd, Millmont, PA 17845

Est: $5,568/moGet pre-approved

Single FamilyProperty Type

9.17 acresLot Size

1969Year Built

$172/sq ftPrice per sq ft

3 carsParking Spaces

Description

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...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.

15 days on Market

Listed by: Blain Berrier 717.645.6418 bberrier@rsrrealtors.com • RSR, REALTORS, LLC
Listed by: JEFF KOURY 717.439.2047 jeffkoury@rsrrealtors.com • RSR, REALTORS, LLC

Last updated: 09/07/2026 11:59 AM • Source: BRIGHT, MLS#: PAUN2000880

Location

Listing Courtesy of RSR, REALTORS, LLC

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$5,568 per month

30 year fixed, 6.71% Interest

Principal and Interest

$5,168

Property Taxes

$400

HOA Dues

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Property Information for 410 Hassenplug Road

Property Details

Taxes: $4,804 / year
MLS Type: Residential / Fee Simple
County: Union County
Tax ID Number: 005-005987
Ownership: Fee Simple
Condo Coop Association: No
HOA: No
Structure Type: Detached
Style: Other
Levels/Stories: 2
Waterfront: No
Views: Mountain
Garage: Yes
Subdivision: NONE AVAILABLE
Subdivision: NONE AVAILABLE (UNION PA)
Municipality: HARTLEY TWP
Total Parking Spaces: 3
Central Air: No
Basement: Yes
Room Count: 9
Above Grade Finished SQFT: 987.00
Above Grade Fin SQFT Source: Estimated
Below Grade Finished SQFT: 4,813.00
Below Grade Fin SQFT Source: Estimated
Total Below Grade SQFT: 4,813.00
Total Below Grade SQFT Source: Estimated
New Construction: No

Building Information

Stories: 2
Year Built: 1969
Lot Size: 9.17 AC / 399,445 SF

Location

School District Name: MIFFLINBURG AREA
School District County ID: 801909430992

SchoolDistrictSource: Listing Agent
County: UNION
MLS Area: Hartley Twp (169005)

Waterfront / Water Access

Water View: No
Water Access: No

Water Oriented: No
Navigable Water: No
Tidal Water: No
Riparian Rights Y/N: No

Association / Community Info

Senior Community: No

Taxes and Assessment

Tax Year: 2026
Tax Assessed Value: $224,800

Zoning: COMMERCIAL
Automatically Update Tax Values Y/N: No

Rooms

Main

# Bedrooms Count Main Level: 0
# Bathrooms Count Main Level: 0

# Bathrooms Full Main Level: 0
# Bathrooms Half Main Level: 0

All Lower Levels

# Bedrooms All Lower Levels: 4
# Bathrooms All Lower Levels: 4

# Bathrooms Full All Lower Levels: 4
# Bathrooms Half All Lower Levels: 0

Lower Level 1

# Bedrooms Lower Level: 4
# Bathrooms Lower Level: 4

# Bathrooms Full Lower Level: 4
# Bathrooms Half Lower Level: 0

Rooms

Stories: Lower 1, Main

Building Info

Year Major Reno Remodel: 2002
Total Finished SQFT: 5,800.00

Total Finished SQFT Source: Estimated
Total SQFT: 5,800.00
Total SQFT Source: Estimated
Construction Materials: Concrete
Ext Main Mid-res: http://bright-media02.prd.brightmls.com/bright/images/0000/8053/5393/4754/805353934754_512_384_WM_LEYi_0YmgF4G1ExG.jpg
Basement Type: Fully Finished
Foundation Details: Concrete Perimeter
Room and Floor: Bedrooms-Lower Level 1-1, Bedrooms-Lower Level 1-2, Bedrooms-Lower Level 1-3, Bedrooms-Lower Level 1-4, Bathrooms Full-Lower Level 1-1, Bathrooms Full-Lower Level 1-2, Bathrooms Full-Lower Level 1-3, Bathrooms Full-Lower Level 1-4
# Bathrooms Full: 4
# Bathrooms Half: 0
Other Structure: Above Grade, Below Grade

Lot / Land Information

Lot Size Source: Estimated
Lot Features: Backs to Trees, Hunting Available, Partly Wooded, Private, Secluded, Rural, Trees/Wooded

Fencing: Barbed Wire, Chain Link
Location Type: Rural

Parking

Type Of Parking: Attached Garage, Parking Lot
Num of Attached Garage Spaces: 3

Total Garage Spaces: 3
Garage Features: Garage - Front Entry, Oversized

Interior Features

Interior Features: Air Filter System, Attic, Bathroom - Jetted Tub, Double/Dual Staircase, Recessed Lighting
Accessibility Features: None

Security Features: Intercom, Main Entrance Lock, Motion Detectors, Security Gate, Security System

Exterior Features

Pool: No Pool

Utilities

Heating: Yes
Cooling Type: Geothermal

Cooling Fuel: Geothermal
Heating Type: Heat Pump(s)
Heating Fuel: Geo-thermal
Hot Water: Electric
Water Source: Well
Sewer Septic: On Site Septic
Electric Service: 200+ Amp Service

Confidential Data

Listing Office

List Agent AOR: Greater Harrisburg Association of REALTORS
List Agent URL: blainberrier.co

Property History for 410 Hassenplug Road

Date	Event & Source	Price	Appreciation
Sep 7, 2026	Listed (Active) BRIGHT #PAUN2000880	$999,999	—
Nov 21, 2024	Closed (Public Record) Public Record #1548155522	$315,000	—

Date	Event & Source	Price
09/07/2026	Listed (Active) BRIGHT #PAUN2000880	$999,999
11/21/2024	Closed (Public Record) Public Record #1548155522	$315,000

For completeness, we often displays two records for one sale: the MLS record and the public record.

Public Records for 410 Hassenplug Road

Taxable ValueLand$101,400Additions$123,400Total$224,800

Tax Record2026$4,804 ($400 / month)

Home Facts

Lot Size399,445 SqFtStyleMiscellaneous CommercialZoningAPCountyUNIONAPN005-108-137.A0000

Schools near 410 Hassenplug Road

This home is within Mifflinburg Area School District.


Rating	School	Type	Grades	Distance
NR	Mifflinburg El School	Public - Serves this home	K to 2	9.6 mi
7/10	Mifflinburg Area Intermediate School	Public - Serves this home	3 to 5	9.8 mi
6/10	Mifflinburg Area Middle School	Public - Serves this home	6 to 8	9.7 mi
6/10	Mifflinburg Area Senior High School	Public - Serves this home	9 to 12	9.1 mi


Rating	School	Distance
NR	Mifflinburg El School PublicK to 2 Serves this home	9.6 mi
7/10	Mifflinburg Area Intermediate School Public3 to 5 Serves this home	9.8 mi
6/10	Mifflinburg Area Middle School Public6 to 8 Serves this home	9.7 mi
6/10	Mifflinburg Area Senior High School Public9 to 12 Serves this home	9.1 mi

School ratings and boundaries are provided by GreatSchools.org and Pitney Bowes. This information should only be used as a reference. Proximity or boundaries shown here are not a guarantee of enrollment. Please reach out to schools directly to verify all information and enrollment eligibility.

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More information about 410 Hassenplug Road, Millmont, PA 17845

410 Hassenplug Road is a single family home for sale in Millmont, PA 17845. This property was listed for sale on September 7, 2026 by RSR, REALTORS, LLC, it's currently listed at $999,999. It has been on the market for a total of 15 days and was last sold on November 21, 2024. This listing's school district is Mifflinburg Area School District. Nearby schools include Mifflinburg El School, Mifflinburg Area Intermediate School and Mifflinburg Area Middle School. 410 Hassenplug Road is a 4-bed, 4-bath, 5,800 sqft single family home built in 1969.

No guarantee, warranty or representation of any kind is made regarding the completeness or accuracy of any information, descriptions or measurements (including square footage measurements and property condition), such should be independently verified through appropriate means, including, but not limited to, in person inspection and public records, and Compass International Holdings, its subsidiaries, affiliates and independently owned and operated franchisees, and their affiliated agents and associated third parties expressly disclaim any liability in connection therewith. Photos may be virtually staged or digitally enhanced and may not reflect actual property conditions. Offers of compensation are subject to change at the seller's discretion. No financial or legal advice provided. Equal Housing Opportunity.

Listing Courtesy of RSR, REALTORS, LLC

Based on information from one of the following Multiple Listing Services: BRIGHT, Greater LeHigh Valley Regional MLS, Greator Scranton Board of REALTORS® and Pocono Mountains Association of REALTORS®. Information being provided is for the visitor’s personal, noncommercial use and may not be used for any purpose other than to identify prospective properties visitor may be interested in purchasing. The data contained herein is copyrighted by BRIGHT, Greater LeHigh Valley Regional MLS, Greator Scranton Board of REALTORS® and Pocono Mountains Association of REALTORS® is protected by all applicable copyright laws. Any dissemination of this information is in violation of copyright laws and is strictly prohibited. Property information referenced on this web site comes from the Internet Data Exchange (IDX) program of the MLS. This web site may reference real estate listing(s) held by a brokerage firm other than the broker and/or agent who owns this web site. For the avoidance of doubt, the accuracy of all information, regardless of source, is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals.

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More information about 410 Hassenplug Road, Millmont, PA 17845