Baltimore City · 00000
3901 HILLEN RD
Property watching is a Pro feature. Join the waitlist to get new permits, violations, and inspections on this property in a daily email digest.
Already have Pro access? Sign in.
- Total assessment
- $45,736,900
- Land use
- Exempt Commercial (EC)
- Year built
- —
- Last sale
- Jul 10, 1986
Assessment
| Owner | MAYOR AND CITY COUNCIL OF |
|---|---|
| Land use | Exempt Commercial (EC) |
| Total assessment | $45,736,900 (cycle 2026) |
| Last sale | Jul 10, 1986 |
| Year built | — |
| Zoning | OS |
| Vacant | — |
Permits
24| Type | Description | Cost | Issued |
|---|---|---|---|
| BCCM | The scope of work involves adding a single low-voltage data drop to support network connectivity. This installation will utilize existing pathways in ceiling and a single 1/2” penetration outside that will not alter, expand, or modify the building’s electrical or communications infrastructure. No service equipment, panels, or structural components will be affected. . | $33,406 | Mar 17, 2026 |
| BCCM | Install new Fluoro K clean agent fire suppression system in server room 003 | $50,000 | Mar 5, 2026 |
| COM2024 | INSTALL (64) # BRANCH CIRCUITS/FEEDERS AS PER CODE. | $1,400,000 | Dec 28, 2024 |
| COM2024 | Extend Original Permit.(original permit:COM2022-03920:BUILDING, MECHANICAL, AND ELECTRICAL PERMIT APPLICATION FOR UPGRADES TO THE CITY MONTEBELLO PLANTS 1 AND 2, ASHBURTON, AND HELLEN SITE LOCATIONS AS PER PLANS AS PER CODE.) | — | Sep 9, 2024 |
| COM2024 | Extend Original Permit.(original permit:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. | — | Jul 24, 2024 |
| COM2024 | [1801 ARGONNE DR] INSTALL (4) NEW LIGHT POLES TOTAL; (2) 60' POLES, (2) 70' POLES WITH 22 FIXTURES TOTAL, PRE-CAST FOUNDATIONS AND ASSOCIATED LIGHTING CONTROLS, UNDERGROUND CONDUITS AND WIRING. INSTALL NEW CT CABINET AND HEAVY-UP EXISTING SERVICE TO 200 AMPS | $73,000 | Apr 16, 2024 |
| COM2021 | (PLANT 2) PROJECT INCLUDES NEW BUILDING CONSTRUCTION AT MONTEBELLO PLANTS 1 AND 2 ALONG WITH UTILITY AND SITE WORK AS PER PLANS AS PER CODE. | $6,668,089 | Apr 15, 2024 |
| COM2024 | Extend Original Permit.(original permit:COM2020-02959:FIRE ALARM SYSTEM AS PER PLANS AS PER CODE.) Original Permit Description:(COM2020-02959) FIRE ALARM SYSTEM AS PER PLANS AS PER CODE. | — | Feb 23, 2024 |
| COM2024 | Extend Original Permit.(original permit:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. | — | Jan 25, 2024 |
| COM2022 | BUILDING, MECHANICAL, AND ELECTRICAL PERMIT APPLICATION FOR UPGRADES TO THE CITY MONTEBELLO PLANTS 1 AND 2, ASHBURTON, AND HELLEN SITE LOCATIONS AS PER PLANS AS PER CODE. | $1,042,553 | Jul 28, 2023 |
| COM2023 | AA CONV: Full Description Loaded as Comment | — | Jul 27, 2023 |
| COM2022 | SCOPE OF WORK:----INTERIOR (EQUIPMENT) ALTERATIONS----MODIFICATIONS TO EXISTING LOW VOLTAGE ELECTRICAL PANELS BOARDS INCLUDING REPLACEMENT OF BREAKERS AT THE MONTEBELLO WATER FILTRATION PLANTS 1 AND 2 AS PER PLANS AS PER CODE. | $6,107,390 | Jul 13, 2023 |
| COM2020 | FIRE ALARM SYSTEM AS PER PLANS AS PER CODE. | $28,000 | Feb 24, 2023 |
| COM2023 | EXTEND: (ORIGINAL PERMIT:COM2022-72802: EXTEND ORIGINAL PERMIT.(ORIGINAL PERMIT:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) ORIGINAL PERMIT DESCRIPTION:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2022-72802) Extend Original Permit.(original permit:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. | — | Feb 1, 2023 |
| COM2023 | REINSTATE ORIGINAL PERMIT.(ORIGINAL PERMIT:COM2019-02437:INSTALLING A NEW NFPA 13 WET PIPE SPRINKLER SYSTEM (46 HEADS) AS PER PLANS AS PER CODE.) Original Permit Description:(COM2019-02437) INSTALLING A NEW NFPA 13 WET PIPE SPRINKLER SYSTEM (46 HEADS) AS PER PLANS AS PER CODE. | — | Jan 26, 2023 |
| COM2022 | Extend Original Permit.(original permit:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. | — | Aug 6, 2022 |
| COM2021 | Extend Original Permit.(original permit:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. | — | Dec 27, 2021 |
| COM2021 | ADD 52 SPRINKLER HEADS TO CHANGE THE LAYOUT OF THE SYSTEM AS PER PLANS AS PER CODE. (ASSOCIATED WITH WORK DONE UNDER PERMIT# COM2021-53143). | $66,000 | Oct 27, 2021 |
| COM2021 | Extend Original Permit.(original permit:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. | — | Aug 5, 2021 |
| COM2021 | REINSTATE ORIGINAL PERMIT.(ORIGINAL PERMIT:COM2019-02437:INSTALLING A NEW NFPA 13 WET PIPE SPRINKLER SYSTEM (46 HEADS) AS PER PLANS AS PER CODE.) Original Permit Description:(COM2019-02437) INSTALLING A NEW NFPA 13 WET PIPE SPRINKLER SYSTEM (46 HEADS) AS PER PLANS AS PER CODE. | — | Mar 2, 2021 |
| COM2020 | AMEND PERMIT: ADD ELECTRICAL CONTRACTOR .(ORIGINAL PERMIT:COM2018-03610:INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. ) Original Permit Description:(COM2018-03610) INFRASTRUCTURE IMPROVEMENT PROJECT AT MONTEBELLO FILTRATION PLANT NO. 1 INCLUDING NEW BUILDING CONSTRUCTION (GENERATOR BUILDING, WALK-IN SWITCHGEAR, AND UNIT SUBSTATION), IMPROVEMENTS TO THE EXISTING WATER FILTRATION PLANT, NEW ACCESS DRIVE TO PLANT, UTILITY CONSTRUCTION INCLUDING: WATER, SEWER, STORM, ELECTRICAL, GAS, ETC. AS PER PLANS AS PER CODE. SEPARATE PERMIT WILL BE REQUIRED FOR SPRINKLER AND FIRE ALARM SYSTEM. | — | Nov 12, 2020 |
| COM2019 | installing a new nfpa 13 wet pipe sprinkler system (46 heads) as per plans as per code. | $66,000 | Dec 11, 2019 |
| COM2019 | install (11) # branch circuits/feeders , (1) 45 kw transformer as per code. | $24,200 | Nov 14, 2019 |
| COM2018 | infrastructure improvement project at montebello filtration plant no. 1 including new building construction (generator building, walk-in switchgear, and unit substation), improvements to the existing water filtration plant, new access drive to plant, utility construction including: water, sewer, storm, electrical, gas, etc. as per plans as per code. separate permit will be required for sprinkler and fire alarm system. | $44,400,000 | Feb 14, 2019 |
Violations
0No violations on record.
Inspections
0No inspections on record.
Records marked with * are matched by address, not a direct account link. Data is informational only.
Data freshness: city-311: 2026-07-12; city-ecb-citations: 2026-07-12; city-housing-inspections: 2026-07-12; city-permits: 2026-07-12; city-real-property: 2026-07-12; city-vbn: 2026-07-12; county-permits: 2026-07-12; sdat-properties: 2026-07-12;
Official sources: Maryland SDAT, Baltimore City permits.