ACORN, which bills itself as "an independent national organization of low- and moderate-income families," helped Rokonuzzaman and other tenants organize Saturday's protest.
Amongst the thefts and pest problems, tenants say they have been called "rude" and "racist" by property managers, Rokonuzzaman alleges.
It's an attitude he says creates "systemic fear" for those living at 30 Denton Avenue.
Rokonuzzaman pointed to tenants who he says have been sleeping on couches to avoid bedbugs, calling the conditions "miserable."
Other tenants at the protest agreed, chanting slogans with ACORN organizers.
Some, like Mohammad Ud-doula, think the management's treatment of tenants stands in the way of a friendly community.
"The main problem is their attitude towards us as tenants," said Ud-doula, who has lived in the building for nine years.
"More communication, more listening, and a better attitude" is needed from management, he added.
No 'issues of significance,' Realstar exec says
Ud-doula says residents asked management to place security cameras in the hallways on each floor to fight vandalism and theft, but says management refused, citing privacy issues.
Realstar senior vice president Mark Hales told CBC Toronto on Saturday the company has done all they can to prevent break-ins, including the installation of 30 security cameras and new lights, hiring night security patrol and adding an electronic access system to the main entrance.
But of break-ins, Hales said, "unfortunately they can happen anywhere and we take them seriously."
Hales added he isn't currently aware of any outstanding maintenance problems at the property.
'We have investigated and aren't aware of any issues of significance," he said.
New bylaws to guide landlord-tenant disputes
ACORN organizers pointed to new apartment bylaws in the city, which came into effect July 1, as impetus for Realstar to take protesters' concerns seriously.
The bylaws, collectively called "RentSafeTO," impose standards for rental maintenance on managers that would compel them to carry out regular pest inspections and respond to service requests within a set timeframe.
Hales says Realstar stands by their staff at 30 Denton Avenue, but said lines of communication with tenants would be kept open.
"The residents are entitled to voice their concerns and we respect that," he said.
Tenants with complaints, Hales added, are "welcome to approach management office to discuss that."