Hawai'i Tenant Referral Services. HCA has established Hawai'i’s first and only tenant referral service available to individuals and families enrolled in its housing and financial education programs. Through Hawai'i Tenant Referral Services, HCA works with a network of rental and property management companies, private landlords, rental housing developers, and government agencies to refer financially qualified renters to secure vacant properties and units on a fee-for-service basis.