....or...do you mean can we agents get referrals for listing homes from property management companies (answer: sometimes. Depends who ya know).
If you're looking for rental listings, check each mgmt. company's web site, or google "Sacramento rentals". If you're trying to establish the rent value of a home you own, do the same google search, and call the management companies and ask them for their advice. They'll want your business, so will be happy to help.