Why do commercial projects finish late?

http://www.akwaibomnewsonline.com/news/index.php?url=https://nyc3.digitaloceanspaces.com/us-east-1/capitalregionbuildreport/uncategorized/how-long-does-an-office-fit-out-take-in-albany-ny.html

Clifton Development Group on the four causes in order of how often they happen, starting with owner decisions made late and long-lead equipment ordered after permit.