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(Updated 10/17/25)BloomWatertown High School
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Source:
https://docs.google.com/spreadsheets/d/1dXRLDxydIe2S3NOsS7JcMIzSuvcjIBw2/edit?usp=sharing&ouid=116971253884586510151&rtpof=true&sd=true
https://share.google/aimode/R7dqHzx2nNtBU4nNa
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Gross square feet510,209200,032not including 58,882 sq ft of underground garage space per page 2 of 3 of https://www.massschoolbuildings.org/sites/default/files/edit-contentfiles/About_Us/Board_Meetings/2022_Board/3_2_2022/1.%20Watertown_High%20School_PS%2BB%20Memo_Final.pdf and https://www.watertownmanews.com/2022/03/23/council-approves-borrowing-198-million-for-state-of-the-art-green-watertown-high-school/
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Number of students2,395720
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square feet per student213278Bloom offers23%
less space per student than the Watertown High School
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Cost$660,000,000$220,000,000
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minus$24,900,000swing space (not needed during Bloom construction) per https://www.watertownmanews.com/2021/12/10/watertown-high-school-project-remains-on-budget-even-with-expanded-gym-increase-in-construction-costs/
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minus$15,309,320128 parking spaces, in 1-level underground parking, 58,882 square feet, at $260/sq ft, mid-range of the $170-$350/sq ft cost of a 1-level garage (per https://share.google/aimode/66ACGgQg5znjT8PFZ)
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Apples-to-apples cost (unescalated)
$660,000,000$179,790,680
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Apples-to-apples cost
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escalated to mid 2028$660,000,000$198,408,416
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at % escalation rates below
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Escalated apples-to-apples cost
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per gross square foot$1,294$992Bloom costs30%
more than the Watertown High School per square foot
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($s of mid 2028)
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Year
Cost escalation
Source
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20155.25%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
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20164.75%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
Watertown annual
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20175.25%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
Watertown annual
Watertown annual
expenditures
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20185.50%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
Watertown annual
expenditures (swing
expenditures
comparable to Bloom
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20196.05%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
total expenditures
Source
space & underground garage)
Source
comparable to Bloom
escalated to 2028
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20201.00%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$455,244Watertown City Auditor Megan Langan$455,244$660,146
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202112.00%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$457,557Watertown City Auditor Megan Langan$457,557$592,411
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202212.25%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$7,054,112
Watertown City Auditor Megan Langan
$2,010,466
estimate pending data from Watertown City Auditor Megan Langan
$5,043,646$5,817,496
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20232.00%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$30,039,337
Watertown City Auditor Megan Langan
$24,125,592
estimate pending data from Watertown City Auditor Megan Langan
$5,913,745$6,687,348
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20240.50%
slide 7 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$58,085,282
Watertown City Auditor Megan Langan
$14,073,262
estimate pending data from Watertown City Auditor Megan Langan
$44,012,020$49,521,818
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20251.00%
slide 8 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$78,233,395Watertown City Auditor Megan Langan$78,233,395$87,155,757
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20263.00%
slide 8 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$11,330,854Watertown City Auditor Megan Langan$11,330,854$12,255,452
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20274.00%
slide 8 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
$34,344,219Watertown City Auditor Megan Langan$34,344,219$35,717,988
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20284.00%
slide 8 of https://lexingtonma.gov/DocumentCenter/View/14955/20250731-PBC-Meeting-R1
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Total:$220,000,000
Watertown City Auditor Megan Langan
$40,209,320$179,790,680$198,408,416
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