Perhaps more for the general interest of anyone reading this post ( Colonel Schulz is focused on the need for the strata manager to give notice ) you may be fazed by seeing in your agreement a requirement that the OC gives Notice TO the strata manager if they wish to terminate – Prior to the 2015 Act not giving Notice could mean that an OC could be caught up in an Agreement that extended for a new term beyond the expiry date by default – a hazard for the unwary.
With the 2015 Act the max term for a Strata Management Agreement is 3 years and, as Keymaster says, it can ONLY be extended by resolution of the strata committee and then for a limited time. This effectively makes Notice by either party of less consequence when an agreement is coming up to a full 3 year term.
The pre 2015 Act 3 year agreements are now coming to an end but if your agreement has a Notice provision, giving Notice per the agreement, whilst not necessary to avoid a renewal of the agreement does provide protection, unless you are comfortable with the strata manager exercising the limited 3 month extension option afforded to them by s50 (7).