Finding Tenants

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I have a fairly simple question for the landlords out there. I am planning on purchasing a 4-plex that is fully rented, but in the future when leases end or tenants decide to getup and leave. Where do you find you tenants. In the town I live in we have the general Apartment finder books in most convenience stores but they do not include duplexes or anything close to it. What is the best way to attract attention to your property. Thanks for your help.