COMMISSION 
AGENDA MEMORANDUM                        Item No.          10e 
ACTION ITEM                            Date of Meeting     November 9, 2021 

DATE:     November 2, 2021 
TO:        Stephen P. Metruck, Executive Director 
FROM:    Eileen Francisco, Interim Director, Aviation Facilities and Capital Programs 
Wayne Grotheer, Director, Aviation Project Management Group 
SUBJECT:  Main Terminal Improvements Program C801266  Additional Scope Authorization 
Amount of this request:                       $0 
Total estimated project cost:       $800,000,000-
$1,000,000,000 
ACTION REQUESTED 
Request Commission authorization for the Executive Director to add scope to the Seattle-Tacoma
International Airport (SEA) Main Terminal Improvements Program to complete a Program
Definition Document (PDD). The total estimated program cost is $800,000,000 - $1,000,000,000.
There is no funding associated with this request. 
EXECUTIVE SUMMARY 
The Commission authorized preliminary design funds for the Main Terminal Infrastructure
Upgrades Program at the SEA on October 13, 2020, for $5,000,000. The focus of that program
was to ensure compliance with current life safety portions of the building code for the Main
Terminal, including the addition of sprinklers and smoke control. Since that time, scope items
were identified to refresh and renovate the existing 1970 Main Terminal. The new scope includes
renewal and replacement of critical systems such as bag claim devices, elevators, signage, and 
domestic water piping; renovation of existing restrooms on the mezzanine, ticketing, and
baggage claim level; security improvements; evaluation of potential airport dining and retail
buildout; and upgrades to the architectural finishes that will integrate with the North Main
Terminal Redevelopment. Rather than try to complete these scope elements as separate projects
at a future date, the Airport is requesting to complete one comprehensive program, Main
Terminal Improvements. 
The North Main Terminal Program will be improving the passenger experience on the north end
of the Main Terminal (Zones 6 & 7). The Main Terminal Improvements Program will address the
remainder of the Main Terminal. This program does not anticipate making changes at any
checkpoints or reconfiguring ticket counters.  Approval of this request will allow for a

Template revised January 10, 2019.

COMMISSION AGENDA  Action Item No. __10e__                             Page 2 of 5 
Meeting Date: November 9, 2021 
comprehensive preliminary design document for all scope, including  Sustainable Project
Assessment and Review Collaboration (SPARC)  process integration and development of a
preliminary Sustainable Design Approach. This document can be completed under the existing
authorized funding amount of $5,000,000. The Main Terminal Program will coordinate closely
with the North Main Terminal program to ensure that scope is not duplicated and that all
upgrades are consistent throughout the terminal. 
Staff will return to the Commission following the completion of the Program Definition Document 
(PDD). At that time staff will provide an updated project cost estimate and request authorization
to move forward with the next phase of project delivery.
JUSTIFICATION 
The original scope of the Main Terminal Infrastructure Upgrades program was to address life
safety code systems within the Main Terminal. The work to address those deficiencies will be
highly impactful to the passenger experience and operations. Given the long duration of the
program and the impacts, other scope was evaluated for inclusion. Benefits to adding this
additional scope include: a consistent passenger experience from the north to the south end of
the terminal, a comprehensive plan for phasing; holistic approach to managing operational
impacts; coordinated disruptions to spaces; and efficiencies gained by completing the work
together as one program. 
Diversity in Contracting 
The existing A/E consultant contract to be used for this work includes a 15% WMBE Goal. 
DETAILS 
The existing Main Terminal was built in the 1970s, with an extension to the north added in the
1980s, and the Gina Marie Lindsay Arrivals Hall added in the 2000s.  Although some
improvements have been made in the Main Terminal there has not been a comprehensive
renovation. The Main Terminal is open 24/7 and is the single point of entry for passengers
departing from the Airport and exit for those arriving. The PDD will evaluate the scope elements
defined below and will also consider phasing and constructability 
Scope of Work 
The scope of the PDD will include an evaluation of the code elements previously identified; 
renewal and replacement of critical systems such as bag claim devices, elevators, signage, and
domestic water piping; renovation of exiting restrooms on the mezzanine, ticketing, and baggage
claim level; security improvements; evaluation of potential airport dining and retail buildout;
development of a Sustainable Design Approach; and upgrades to the architectural finishes that
will integrate with the North Main Terminal Redevelopment. The PDD will include evaluating 
scope, schedule, and budget. In addition, the PDD will consider construction phasing and staging. 
The program has a targeted budget of $800,000,000. 

Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. __10e__                             Page 3 of 5 
Meeting Date: November 9, 2021 
Schedule 
Estimated Activity Milestones 
Completion of Project Definition Document      2022 Quarter 4 
Commission design authorization               2023 Quarter 1 
Design start                                       2023 Quarter 2 
Commission construction authorization          2025 Quarter 2 
Construction start                                2025 Quarter 2 
In-use date                                       2033 Quarter 4 
Cost Breakdown                                     This Request           Total Project 
Preliminary Design                                                $0             $5,000,000 
Construction                                                     $0                     $0 
Total                                                                  $0              $5,000,000 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
As part of the process in determining the scope needs to update the Main Terminal to meet
current code requirements, renewal and replacement needs, and provide a refresh to a 50-yearold
building the project team is evaluating doing most of the work in a program. In conjunction
with the PDD, the project team will solidify the cost estimates for doing the work in one large
program versus multiple smaller projects that would overlap and likely constrain the working
areas between contractors. The current estimated cost of the large program is $800,000,000-
$1,000,000,000 but more work needs to be done on the PDD properly determine the costs of all
alternatives. 
Alternative 1  Continue to move forward the Main Terminal Infrastructure Upgrades and other
scope items as separate projects. 
Pros: 
(1)   Some components may be delivered quicker as individual projects 
Cons: 
(1)   Will require very careful coordination to manage several different projects occurring in
the same space at the same time 
(2)   May require some scope elements to be deferred until after larger projects are
complete 
(3)   May require repeated disruptions to spaces as different elements are moved forward
as separate projects in the same space 
(4)   Additional staff would be needed to manage multiple smaller projects 
(5)   Could result in more change orders will all multiple contractors working in the same
area 
This is not the recommended alternative. 

Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. __10e__                             Page 4 of 5 
Meeting Date: November 9, 2021 
Alternative 2  Initiate full design 
Pros: 
(1)   May be able to deliver the program sooner 
Cons: 
(1)   Scope will have to be defined during the design process 
(2)   Does not allow for through and accurate estimating to be done before starting the
project. 
This is not the recommended alternative. 
Alternative 3  Add additional scope to the preliminary design for a comprehensive Main
Terminal Improvements Program 
Pros: 
(1)   Will have one comprehensive program definition document for key elements in the
main terminal 
(2)   Coordinated construction of scope elements to limit the disruption to operations and
the passenger experience 
(3)   Simplified coordination with the North Main Terminal Program 
Cons: 
(1)   Some components may take longer to deliver than if completed separately. 
This is the recommended alternative. 
FINANCIAL IMPLICATIONS 
Cost Estimate/Authorization Summary              Capital        Expense           Total 
COST ESTIMATE 
Original estimate                               $800,000,000     $11,206,000   $811,206,000 
AUTHORIZATION 
Previous authorizations                          $5,000,000               $0      $5,000,000 
Current request for authorization                         $0               $0               $0 
Total authorizations, including this request       $5,000,000               $0      $5,000,000 
Remaining amount to be authorized          $795,000,000    $11,206,000   $806,206,000 
Annual Budget Status and Source of Funds 
This project, CIP C801266, was included in the 2022-2026 capital budget and plan of finance with
a budget of $800,000,000. The funding source will be revenue bonds. 

Template revised June 27, 2019 (Diversity in Contracting).

COMMISSION AGENDA  Action Item No. __10e__                             Page 5 of 5 
Meeting Date: November 9, 2021 
Financial Analysis and Summary 
Project cost for analysis              $800 million - $1 billion 
Business Unit (BU)                  Terminal Building 
Effect on business performance     NOI after depreciation will increase due to inclusion of
(NOI after depreciation)             capital (and operating) costs in airline rate base 
IRR/NPV (if relevant)                N/A 
CPE Impact                       Between $2.23 - $2.79 
Future Revenues and Expenses (Total cost of ownership) 
The addition of a new emergency power system and smoke control system will increase
maintenance costs as additional assets come online; however, the removal of asbestos in the
ceiling will make maintenance easier and faster as asbestos control will no longer be required for
ceiling entry. A fuller review of total cost of ownership will be completed as the program moves
forward and the scope is more fully defined. 
ATTACHMENTS TO THIS REQUEST 
(1)   Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
October 13, 2020  The Commission authorized preliminary design for the Main
Terminal Infrastructure Upgrades Program. 
September 22, 2020  The Commission was briefed on the overall project and
intended use for the preliminary design funding request. 








Template revised June 27, 2019 (Diversity in Contracting).