"Administrative coordination fee" is not a standard fee category the industry uses. Common named fees in management agreements include a leasing fee (charged when a new tenant signs), a maintenance markup (a percentage added to vendor invoices, often 10 to 15 percent), and a supervision fee for large capital projects. Those are the ones you would normally see described by name in your agreement.
What you are describing, a flat $2,100 charge for time spent coordinating a repair, is sometimes called a project management fee or construction oversight fee. Some managers do charge this legitimately, but the key word is legitimately: it has to be in your management agreement before the work starts, not invented on the statement afterward.
Here is the number that matters for your situation. A 10 percent markup on a $6,800 repair comes to $680. A 15 percent markup comes to $1,020. The $2,100 charge is roughly 31 percent of the invoice, which is well outside the normal range even if the fee were clearly defined.
I would ask your property manager, in writing, to point to the exact clause in your management agreement that authorizes this fee. If they cannot, you have a legitimate dispute. A real estate attorney in Colorado can tell you what your options are if the manager does not resolve it, and that conversation is worth having before you escalate.
The thing worth knowing for the future: management agreements often allow fees that sound vague when you sign, and those gaps tend to show up on large invoices. Reviewing the fee schedule section before a big repair is approved is a reasonable habit.
Can you share whether your agreement has any language about project oversight, construction management, or capital work? That would help narrow down whether this was disclosed at all.