If you want to go the smaller building route and aren’t confident to DIY, the surest way to do such a thing would be to go through a broker. A rental broker will find listings on the MLS that meet your criteria, arrange showings, help you evaluate the units, and sometimes can even negotiate a slightly better deal for you. A broker generally charges the equivalent of one-month’s rent, but if you have a good broker they’ll try to negotiate that the landlord pays their fee instead of you.