Template revised January 10, 2019.
COMMISSION
AGENDA MEMORANDUM
Item No. 8d
ACTION ITEM Date of Meeting May 27, 2025
DATE : May 19, 2025
TO: Stephen P. Metruck, Executive Director
FROM: Keri Stephens, Director, Aviation Facilities and Capital Programs
Eileen Francisco, Director Aviation Project Management
SUBJECT: Parking Garage Rehabilitation (#C801307)
Amount of this request: $ 6,785,000
Total estimated project cost:
$55,709,000
ACTION REQUESTED
Request Commission authorization for the Executive Director to complete the design for the
Parking Garage Rehabilitation project at Seattle-Tacoma International Airport (SEA) for a total
authorization of $8,885,000.
EXECUTIVE SUMMARY
The SEA Parking Garage was constructed in three phases; the oldest central portion dating back
to 1969 has passed its 50-year asset life, and two outboard expansion phases that were
constructed in the 1990s. The project will provide architectural, fire suppression,
mechanical/HVAC, medium voltage power, storm drainage, and structural/seismic
improvements necessary to extend the asset life of the facility and meet current code
requirements. The SEA Parking Garage currently supports public parking and ground
transportation operations and is the highest non-aeronautical revenue generator at SEA.
In November 2023, Commission authorized the execution of a project-specific design services
contract and the completion of preliminary work. This request supports the completion of design
and is within budget; additional Commission authorization will be required for construction.
JUSTIFICATION
This project supports the following Century Agenda strategic goal to advance this region as a
leading tourism destination and business gateway, through the objective to meet the region’s air
transportation needs by delivering vital facilities and infrastructure in a sustainable and cost-
effective manner. The SEA Parking Garage is a major facility supporting both public parking
(terminal direct, general, and pre-booked parking) and ground transportation (app based
rideshare, courtesy vehicle, cruise charter bus, door to door service, pre-arranged limousine, and
COMMISSION AGENDA – Action Item No. 8d Page 2 of 5
Meeting Date: May 27, 2025
Template revised June 27, 2019 (Diversity in Contracting).
taxi) operations. In 2024 public parking generated $111.0 million, and ground transportation
generated $25.3 million, in operating revenue for the Port. This aging facility has had an increased
frequency of failing infrastructure and systems, and outdated systems that no longer support the
operational need or meet current code requirements.
Diversity in Contracting
The design services contract for this project has a 30% commitment for women and minority
business enterprises (WMBE) participation.
DETAILS
This project will address the most critical aging facility components including architectural, fire
suppression, mechanical/HVAC, medium voltage power, storm drainage, and structural/seismic.
Separate efforts have already been completed, or are underway, that address communications,
lighting, low voltage power, revenue control, and vertical circulation systems within the facility.
As part of the preliminary work a conditions assessment was completed that identified the
deficiencies within the SEA Parking Garage and the codes and standards that will be utilized to
address those deficiencies. This request will support the completion of the facility assessment
report, and the design of the prioritized improvements that will be completed as part of this
project. Future Commission authorization will be required to support the construction of the
improvements. It is likely that future projects will need to be programmed to address the full list
of deficiencies identified in the conditions assessment and extend the service life of the facility.
Scope of Work
Port staff anticipates that the full project scope will include the following, and will need to be
delivered through this and future projects:
• Architectural: The installation of new or replacement of failed or failing weatherproofing
membranes and required accessibility improvements.
• Fire Suppression: The replacement or upgrade of the two separate fire suppression systems in
the facility to meet code requirements.
• Mechanical/HVAC: The replacement or upgrade of existing ventilation systems to meet code
requirements.
• Medium Voltage Power: The replacement or upgrade of the medium voltage power system to
support included scoped improvements.
• Storm Drainage: The replacement of failed or failing infrastructure, and a new connection into
the storm drainage system instead of the industrial wastewater system providing capacity
relief for SEA’s industrial wastewater treatment plant.
• Structural/Seismic: The renewal/repair of existing structural elements, replacement of
expansion joints, and structural and seismic upgrades.
COMMISSION AGENDA – Action Item No. 8d Page 3 of 5
Meeting Date: May 27, 2025
Template revised June 27, 2019 (Diversity in Contracting).
Schedule
Design Complete 2026 Quarter 4
Begin Construction 2027 Quarter 1
In-use date 2030 Quarter 1
Cost Breakdown This Request
Total Project
Design $6,785,000
$8,885,000
Construction $0
$46,824,000
Total $8,885,000
$55,709,000
ALTERNATIVES AND IMPLICATIONS CONSIDERED
Alternative 1 – Stop work and defer improvements or upgrades for the SEA Parking Garage
Cost Implications: $1.1 Million (estimated costs to date)
Pros:
(1) No additional capital cost required.
Cons:
(1) Does not address the current identified deficiencies or code requirements.
(2) Defers investment to extend service life of critical SEA asset and thereby increasing risk
of facility failure.
(3) Does not provide capacity relief for SEA’s industrial wastewater treatment plant.
This is not the recommended alternative.
Alternative 2 – Address code requirements and critical structural repairs/upgrades for the SEA
Parking Garage.
Cost Implications: $30,000,000
Pros:
(1) Addresses code requirements.
(2) Reduced capital investment required.
(3) Extends the service life of some infrastructure systems of critical SEA asset.
Cons:
(1) Does not address all the current identified deficiencies.
(2) Defers investment for some infrastructure systems to extend service life of critical SEA
asset.
(3) Does not provide capacity relief for SEA’s industrial wastewater treatment plant.
This is not the recommended alternative.
COMMISSION AGENDA – Action Item No. 8d Page 4 of 5
Meeting Date: May 27, 2025
Template revised June 27, 2019 (Diversity in Contracting).
Alternative 3 – Address code requirements and prioritized deficiencies for the SEA Parking
Garage.
Cost Implications: $55,709,000.00
Pros:
(1) Addresses code requirements and identifies deficiencies.
(2) Extends the service life of the SEA Parking Garage, a critical asset.
(3) Provides capacity relief for SEA’s industrial wastewater treatment plant.
Cons:
(1) Requires greater capital investment.
This is the recommended alternative.
FINANCIAL IMPLICATIONS
Cost Estimate
/Authorization Summary Capital
Expense
Total
COST ESTIMATE
Original estimate $55,709,000
$0
$55,709,000
AUTHORIZATION
Previous authorizations $2,100,000
$0
$2,100,000
Current request for authorization $6,785,000
$0
$6,785,000
Total authorizations, including this request $8,885,000
$0
$8,885,000
Remaining amount to be authorized $46,859,000
$0
$46,859,000
Annual Budget Status and Source of Funds
This project #C801307 was included in the 2025-2029 capital budget and plan of finance with a
total budget of $55,709,000. This project will be funded by the Airport Development Fund and
future bonds.
Financial Analysis and Summary
Project cost for analysis $55,709,000
Business Unit (BU) Public Parking
Effect on business performance
(NOI after depreciation)
NOI after depreciation will decrease
IRR/NPV (if relevant) N/A
CPE Impact N/A
Future Revenues and Expenses (Total cost of ownership)
The operation and maintenance costs are anticipated to increase with improvements to the fire
suppression and ventilation systems. Based upon the average yearly rainfall, costs for the
COMMISSION AGENDA – Action Item No. 8d Page 5 of 5
Meeting Date: May 27, 2025
Template revised June 27, 2019 (Diversity in Contracting).
treatment of stormwater from the SEA Parking Garage is expected to decrease by $135,000
annually.
ADDITIONAL BACKGROUND
The SEA Parking Garage Rehabilitation Project is one of several projects occurring in the SEA
Parking Garage. These other projects include:
Parking Garage Elevators Modernization (C800789): This project is currently under
construction and will replace the existing elevator systems and rehabilitate the elevator cab
interiors. Work is anticipated to be completed by Q2 2026.
Parking Garage Low Voltage (C800901): This project is currently under construction and will
replace the low voltage power distribution equipment in the Parking Garage. Work is
anticipated to be completed by Q2 2027.
3
rd
Floor Ground Transportation Booth Enhancements (C801128): This project has advertised
for construction bids and will renovate and expand the ground transportation booth and
adjacent restrooms on the third floor of the Parking Garage. Work is anticipated to be
completed by Q2 2026.
Parking garage UPS Replacement (C801329): This project is in preliminary design and will
replace the uninterruptible power supplies (UPS) supporting revenue control equipment at
the parking entrances and fourth floor payment kiosks. Work is anticipated to be completed
by Q1 2027.
ATTACHMENTS TO THIS REQUEST
(1) Presentation slides
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS
November 21,2023 – The Commission authorized the execution of a project-specific design
services contract and completion of preliminary project work for $2,100,000.
