Firing 1-under the card in the final round was enough for Cabban to collect his biggest win of 2016 with a two round total of 6-under 138.
Cabaan was happy to see his hard work translating into results on the Choice PGA Pro-Am Series.
"This is a result of lot's of hard work in recent times," said Cabban.
Townsend fired the low round of the tournament shooting a 6-under 66 to overcome his first round 73 to finish outright second ahead of 2015 PGA Tour of Australasia Player of the Year Matthew Millar, rookie Dale Brandt-Richards and the 2015 NSW/ACT Order of Merit winner Callan O'Reilly.
Other notable finishes were had by Steve Conran who finished in a tie for 8th and Dimi Papadatos who fell out of contention on Tuesday with a 4-over 76 leaving him in 16th place.
The Mulpha Castle Hill Pro-Am was recently awarded the NSW/ACT City Pro-Am of the Year for 2015, making it three consecutive years of success in the category.
"It was a great honour to receive the award and worthy recognition for all the hard work which the club management and staff put in to the tournament," said David Northey, Head PGA Professional at Castle Hill.
From Castle Hill many players will head to Barnwell Park Golf Club in Inner West Sydney for the 2016 Option Finance Barnwell Park Pro-Am which starts on Thursday ahead of the Easter break.
Headlines at a glance
- Coletta continues golden era at Queensland Open 23.10.2016
- Coletta wins the Isuzu Queensland Open 23.10.2016
- Hend has hot round to stay in OOM hunt 23.10.2016
- Highlights: Isuzu QLD Open Round 3 Highlights 23.10.2016
- Coletta motivated by disappointment at the Queensland Open 22.10.2016
- Webb wins the National Futures Championship 22.10.2016
Coletta continues golden era at Queensland Open
The golden era of Australian amateur golf continued today at the Isuzu Queendsland Open with amateur Brett Coletta recording a convincing victory.
Hend has hot round to stay in OOM hunt
Asian Tour Order of Merit leader Scott Hend recovered from illness to shoot a superb nine-under-par 63 in the third round of the US$7 million CIMB Cla...
Highlights: Isuzu QLD Open Round 3 Highlights
Watch all the highlights of the third round of the 2016 Isuzu Queensland Open.