Magnolia 'Little Gem'-easily controlled to te height range that suits your requirements ben. Will generally form a clipped block of foliage over time though not as dense as the lilly pilly we chatted about. *Could be used as a "pleached" hedge(st
Line the driveway on Johns side - Syzygium australe 'Aussie Southern' / Lilly Pilly. Could be good for screening the neighbour's garage, behind the jacaranda. Looks like it is quite narrow, or can be kept that way at least.
DECIDUOUS: Ornamental Pear (Pyrus calleryana 'Capital') for an informal screen. Deciduous so we get some sun in winter. Can mix with either the Blueberry Ash or Lilly Pilly evergreen (Syzygium australe 'AATS' PBR Pinnacle)