PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.      6e 
ACTION ITEM 
Date of Meeting     January 26, 2016 
DATE:    January 19, 2016 
TO:      Ted Fick, Chief Executive Officer 
FROM:   Wayne Grotheer, Director, Aviation Project Management Group 
Michael Ehl, Director, Aviation Operations 
SUBJECT:  Gate C3 Passenger Holdroom Expansion Project (CIP #C800695) 
Amount of This Request:       $555,000     Source of Funds:  Airport Development
Fund 
Est. Total Project Cost:       $3,300,000 
Est. State and Local Taxes:      $189,000 
ACTION REQUESTED 
Request Commission authorization for the Chief Executive Officer to proceed with design of an
expansion for the existing Gate C3 passenger holdroom at Seattle-Tacoma International Airport 
in an amount not to exceed $555,000 of a total estimated project cost of $3,300,000. 
SYNOPSIS 
Gate C3 on Concourse C was reactivated in July 2015 as an expeditious solution to the
immediate need for additional aircraft boarding gates.  However, the existing passenger
holdroom at Gate C3 is significantly undersized to serve current mainline narrow-body aircraft
and requires expansion to meet standard level-of-service criteria and avoid congestion on the 
adjacent concourse. This project will more than double the size and seating capacity of the
existing Gate C3 passenger holdroom through the construction of a 1,500 square foot addition 
beyond the existing building footprint. 
BACKGROUND 
Airline activity is increasing at a record-setting pace while forecasts predict that demand for
terminal-connected aircraft gates will exceed supply in early 2016. Having anticipated the
potential shortage, buses and airstairs were purchased in 2015 to support remote gate operations, 
but it is preferable and prudent also to optimize the capabilities of existing terminal connected
aircraft gates to ensure flexibility and utility. Once an active boarding gate, the use of C3 was
discontinued following the economic downturn of 2001 in preference to other, larger boarding
gates in that period of reduced aircraft operations. While it was out of use, the holdroom at C3
was further downsized by adjacent interior concourse development. 


Template revised May 30, 2013.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
January 19, 2016 
Page 2 of 5 
In response to unprecedented growth in 2014, a passenger loading bridge was reinstalled in 2015
at Gate C3. The current holdroom is now drastically undersized to serve mainline aircraft such as
new generation Boeing 737s in use by the airlines operating from this gate. 
PROJECT JUSTIFICATION AND DETAILS 
The current holdroom at Gate C3 is 1,130 square feet, which, per the International Air Transport
Association (IATA) level-of-service standards can only accommodate 120 passengers at the
lowest level of service. As a result, passengers do not have enough seats or enough room to
queue for boarding, which leads to high levels of congestion in the circulation area outside the
holdroom. As the first gate along the north side of the concourse, the resulting congestion makes
it difficult for transiting passengers using the concourse beyond this point. Once this 1,500
square foot building addition is complete, the holdroom will be approximately 2,630 square feet 
compared to the average hold room size at the Airport, which is approximately 2,660 square feet.
The expanded holdroom will provide a comfortable waiting, queuing, and circulation area for the
average number of passengers accommodated on a 737-900 aircraft at a greater IATA level of
service. 
Project Objectives 
This project will expand the holdroom to accommodate 160 seated passengers and provide
circulation and queuing space to better allow mainline aircraft to operate from this gate and
reduce the passenger overflow into the main concourse circulation area. 
Scope of Work 
This project will expand the concourse level building to accommodate a larger Gate C3
holdroom. The building expansion includes utilities and will match adjacent holdroom finishes,
including carpeting and wall and ceiling finishes. Project seating and podium casework will be
provided by the airline tenant. 
Schedule 
Design Start                                     1st Quarter 2016 
Design Completion                             3rd Quarter 2016 
Request Authorization for Construction                   4th Quarter 2016 
Advertise for Bid and Award Construction Contract          4th Quarter 2016 
Construction Start                                  1st Quarter 2017 
Substantial Completion / Asset in use                    2nd Quarter 2018

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
January 19, 2016 
Page 3 of 5 
FINANCIAL IMPLICATIONS 
Budget/Authorization Summary              Capital     Expense   Total Project 
Original Budget                      $3,300,000          $0    $3,300,000 
Previous Authorizations                   $95,000          $0      $95,000 
Current request for authorization              $555,000          $0      $555,000 
Total Authorizations, including this request      $650,000          $0      $650,000 
Remaining budget to be authorized         $2,650,000          $0    $2,650,000 
Total Estimated Project Cost              $3,300,000          $0    $3,300,000 
Project Cost Breakdown                     This Request       Total Project 
Design Phase                              $555,000          $650,000 
Construction Phase                                $0         $2,461,000 
Sales Tax                                      $0          $189,000 
Total                                       $555,000         $3,300,000 
Budget Status and Source of Funds 
This project was included in the 2016-2020 capital budget and plan of finance as a business plan
prospective project (CIP #C800695). The funding source will be the Airport Development Fund. 
Financial Analysis and Summary 
CIP Category             Renewal/Enhancement 
Project Type              Renewal and Replacement 
Risk adjusted discount rate     N/A 
Key risk factors             N/A 
Project cost for analysis        $3,300,000 
Business Unit (BU)          Terminal Building 
Effect on business performance  NOI after depreciation will increase 
IRR/NPV             N/A 
CPE Impact             $.01 in 2018 
Lifecycle Cost and Savings 
Aviation Maintenance anticipates that this project will not significantly affect current ongoing
Operations and Maintenance costs associated with the mechanical and electrical systems. This
could change during the design phase and will be reviewed again at that time. The funding
source will be Revenue Bonds and the Airport Development Fund. 
STRATEGIES AND OBJECTIVES 
By providing a critically needed passenger holdroom expansion, this project promotes the Port's
Century Agenda objectives to make Sea-Tac Airport the West Coast "Gateway of Choice" for
international travel, meet the region's air transportation needs at Seattle-Tacoma International

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
January 19, 2016 
Page 4 of 5 
Airport for the next 25 years, and encourage the cost-effective expansion of domestic and
international passenger and cargo services. 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative 1  Maintain the status quo  Do not expand holdroom (not recommended). 
Cost: $0 
Pros: 
This alternative does not require a capital investment. 
Cons: 
Leaving this holdroom the existing size would significantly limit the C3 gate usage to
regional or smaller aircraft.
At the current square footage, the passengers waiting for most aircraft sizes would
continue to spill over into the circulation area and impede circulation past the gate. 
Impeding traffic circulation in this area might create a condition that could compromise
passenger egress requirements. 
At this square footage the holdroom provides a very low level of customer service
because of a lack of seating, circulation, and queuing space.
Alternative 2  Expand the holdroom into nearby dining space (not recommended). This
alternative would require that adjacent Airport Dining and Retail space be closed and converted
into an enlarged holdroom for Gate C3. 
Cost:   $ 675,000 capital cost 
$ 300,000 lease buy-out 
$5,000,000 (Nominal value of rent payments over ten years) 
$5,975,000 total ten-year nominal cost (lost revenue would continue beyond 10-year
time frame listed above) 
Pros: 
Will provide an additional 1,500 square feet of waiting space for passengers. 
Capital costs are less than Alternative 4 below. 
Cons: 
Would shut down a local business and one of the food service providers on Concourse
C. 
Would necessitate lease buy-back and eliminate lease revenue stream.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
January 19, 2016 
Page 5 of 5 
Alternative 3  Expand the holdroom into concourse corridor space (not recommended). 
Cost:  $ 675,000 capital cost 
Pros: 
Will provide an additional 1,500 square feet of waiting space for passengers. 
Costs less than Alternative 4 below. 
Cons: 
Would impede passenger traffic circulation past the gate. The terrazzo flooring on
Concourse C is publicly commissioned artwork. As such we cannot alter the artwork
without the permission and advisement from the artist. 
A  narrower  passenger  traffic  corridor  could  compromise  passenger  egress
requirements. 
Alternative 4  Expand the holdroom by constructinga new building over the ramp level. 
(recommended) 
Cost:  $3,300,000 capital cost 
Pros: 
Will expand the holdroom to accommodate 160 seated passengers. 
Will provide circulation and queuing space to better allow mainline aircraft to operate
from this gate. 
Will reduce the passenger overflow into the main concourse circulation area. 
Will provide an additional 1,500 square feet of waiting space for passengers. 
Will not impact aircraft positioning, adjacent dining space, or concourse corridor space. 
Cons: 
This is the most expensive alternative in terms of capital cost. 
This is the recommended alternative. 
ATTACHMENTS TO THIS REQUEST 
Presentation slides 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
None