Peel real estate agents say they expect more retail properties to come on the market in the following months.
The reports come as COVID-19 continues to take its toll on retailers.
The latest figures showing Australia experienced its worst-ever month of trading in April as shoppers desert stores.
According to the Australian Bureau of Statistics, there was a record 17.9 per cent fall in purchases in April which ripped $5.38 billion out of the sector.
Raine and Horne Mandurah principal Peter Vetten said Mandurah had always been sluggish in the retail industry.
"Mandurah has always demonstrated a real weakness in its retail end," he said.
"When you look at the demographics in Mandurah there is a very high proportion of retirees, people waiting for a government check of some kind and also the majority don't earn a high wage.
"As a result of this Mandurah locals tend to buy on average more for price than they do for quality.
"This means upper end and bigger retailers tend to be slowly leaving."
This seems to be the trend with Mr Sheepskin, Clearwater Surf and Boards, Beauty Queen, Hogs Express, Cotton On-owned franchises Ruby Shop and Factorie all shutting their doors since the Mandurah Forum redevelopment on March 22, 2018.
Target Meadow Springs is also closing on August 1 as the chain's sales have fallen 2.3 per cent over the last year.
With COVID-19 we will see people changing their buying habits. They will be getting used to buying online.Raine & Horne principal Peter Vetten
Further closures are expected as many people are turning to online to do their shopping since COVID-19 restrictions began.
Unsurprisingly, retail internet sales jumped to a record 10 per cent in April, which is putting further strain on retail stores.
Mr Vetten said he expects retail closures to increase over the following months as COVID-19 continues to take its toll.
"With COVID-19 we will see people changing their buying habits. They will be getting used to buying online," he said.
"We've already seen a bit of an increase in retail properties on sale.
"We are expecting more to come to the market as COVID-19 will spook quite a few owners."