Headquarters Building (HQB) Mechanical and Electrical Upgrades at the Mike Monroney Aeronautical Center (MMAC), Oklahoma City, OK.

SIR 6973GH-26-R-00082 and Attachments 1 through 16 are provided for potential offerors

Amendment 0001 is hereby issued to to provide the Site Visit Attendees, provide Addendum 01 to the Specifications and Drawings included with this SIR, incorporate new AMS Clause 3.6.2-50, Implementation of E.O. 14398(INTERIM April 2026) and incorporate revised AMS Clauses 3.6.1-4 Small Business Subcontracting Plans (INTERIM April 2026) and 3.10.1-15, Changes-Construction, Dismantling, Demolition, or Removal of Improvements (INTERIM April 2026), revise the Minimum Offer Acceptance Period on Page 1, Block 11 of the SIR and AMS Clause 3.2.2.3-2, Minimum Offer Acceptance Period, revise the date for submission of Questions and extend the closing date of the SIR.

Amendment 0002 is hereby issued to revise Provision M.3 RELEVANT EXPERIENCE AND PAST

PERFORMANCE EVALUATION (REVISED MAY 15, 2026).

Amendment 0003 is hereby issued to incorporate Amendment 0003, Attachment 1 - Questions and Answers, Attachment 2 - Addendum 02, Attachment 3 - Asbestos Abatement Information, Attachment 4 - HQB Furniture Information, and Attachment 5 - HQB Requested Photos.