Removing grass may
Some of the SNWA programs requirements are to remove grass and to have at least 50% canopy coverage from plants based on their mature size, ground cover like rock and if an irrigation system is intalled it must be SNWA program compliant.
There are many financial benefits to having well placed trees on a property including reduced energy bills and increased property values. The Arbor Day Foundations website complied some information that we find interesting. Source