Ask an Adviser - Is Investing In An Apartment Complex The Best Way To Secure My Retirement Income?

I'm semi- retired with a super balance of $210,000 and wish to invest $200K in a 12 unit housing complex in Esk in SE Queensland. I own the land (value $150,000). I own 4 other houses valued at $1,300,000 with a $600k mortgage. I have $75k saving, have access to $250k cash in few years and can access $150k if I sell a house now. I also have other income of Gross $36,500 pa and no dependants. I'm looking to get an income from this investment to help fund my retirement. I consider myself low-risk and would like to see a return in 5 years. Is this a good investment or is there a better way to secure retirement income?