Look for any restrictions on letting (especially short-term), pet policies (some attract higher rents), pending special levies, and the building's reputation with property managers. Make sure the scheme allows landlords to claim management fee deductions correctly.
Get a copy of the by-laws before you buy. Some buildings have restrictive letting rules that can limit your rental yield. Some have low minimum lease terms (no Airbnb), which is usually a positive for stable tenants. Talk to local property managers — they'll know which buildings are easy to rent and which aren't.
Compare written fee proposals from strata managers covering your building — free for owners corporations, no obligation.