This is the 716th most frequent Danish word.
kommunens
"Kommunens" means "the municipality's" or "of the municipality" in English.
Here, 'kommunens' is a possessive form attributing ownership of the 'park' to the municipality.
Kommunens park er altid velholdt.
The municipality's park is always well-maintained.
In this sentence, 'kommunens' describes the 'meeting' as being organized by the municipality.
Jeg deltog i kommunens møde om byens udvikling.
I attended the municipality's meeting about the city's development.
The word 'kommunens' in this context is used to explain that the 'investments' belong to or pertain to the municipality.