upkeep
n. uncountable B2 Upper Intermediate US //ˈəpˌkip// UK //ˈʌpkiːp// up·keep
n. the work and money needed to keep a building, machine, or park in good condition. It is what you do to prevent something from breaking or becoming old and dirty.
n. the process of maintaining something in good condition through regular repair or financial support. Refers to both the physical labor and the associated costs of maintenance.
The upkeep of a large garden takes a lot of time.
The city council struggled to find enough money for the upkeep of the historic library.
While the initial purchase price of the estate was surprisingly low, the annual cost of its upkeep proved to be a significant burden for the new owners.
From up + keep.
Usage
Typically used with the preposition 'of' to specify the object being maintained.