I use Ray White Aspley at 7.5% and find them very professional and on the ball. I don't Know where Gordon Park is in relation to Aspley though but they do manage one for me as far north as Bray Park.
All my properties in Brissie are managed by LJ Gilland RE. That's the only thing they do and I recommend them 100%. They are very professional and you as well as the tenants can call them any time any day. They charge for their services but, it isn't all about the money. They really like what they do. I wish they could manage properties in other states too.
No one is better than Carolyn Altoft at Nundah. Try her on 3266 3555 or 0413 057 947. Nundah is 5 min from Gordon Pk and she currently looks after numerous properties in the area.