Mark Sullivan

Areas of expertise

Mark's work focuses on the final phase of commercial construction projects: assembling the closeout package that releases retainage and transfers the building to the owner's operations team. That means working through CSI MasterFormat division by division, verifying that every required deliverable is present, correctly formatted, and project-specific rather than generic manufacturer literature.

The divisions he works with most are MEP-heavy projects: Division 21 (fire suppression), Division 22 (plumbing), Division 23 (HVAC), Division 26 (electrical), and Division 28 (fire alarm and electronic safety). These trades generate the most documentation and the most frequent rejection causes.

About Closeout Desk

Closeout Desk handles commercial construction closeout documentation end to end. Subcontractors and general contractors submit their project files; the team classifies every document, extracts equipment data into a structured register, runs a gap analysis against the project specification, and delivers a complete closeout package ready for owner submission. The goal is a first-submission approval and faster retainage release.

The guides and templates on this blog come directly from that work. Every checklist, rejection pattern, and timing recommendation reflects real project experience, not general construction advice assembled from secondary sources.

Content approach

Each article on the Closeout Desk blog is written to answer a specific question that comes up during closeout, either from GC project managers coordinating documentation from multiple trades, or from subcontractors trying to understand exactly what is required to release their retainage. The writing avoids filler and stays specific: what the document is, who produces it, what a complete version looks like, and what the common rejection causes are.