Five steps from a problem to its solution.

Help me design and build a first working prototype for this problem in Winnipeg, Manitoba, Canada.

Problem: Tenants in Manitoba can't easily tell whether a proposed rent increase follows the rules, or how to object to it.
Who it hurts: Renters in Manitoba, especially long-term tenants in older buildings, who receive a notice of a rent increase above the yearly guideline.
The moment it hurts: Opening a landlord's letter that proposes a rise of hundreds of dollars a month, with no explanation of why it is allowed.
What people do today: Tenants rely on advocacy groups and collective letters to the Residential Tenancies Branch, and often don't know whether their unit is covered by rent control at all.
Why it is still unsolved: Whether a unit is covered depends on the building's age and current rent, the guideline changes each year, and landlords can apply for above-guideline increases, so the answer differs unit by unit.
What solved looks like: A free checker where a Manitoba tenant enters their building's age, current rent and proposed increase, and gets a plain answer: whether rent control applies, the guideline for that year, whether an above-guideline application is needed, and how and by when to object, with links to the Residential Tenancies Branch.
Where: Winnipeg, Manitoba, Canada

First, list what you would need to learn from the people affected before building, as interview questions.
Then propose the simplest version that would help, the screens or messages it needs, and the data it would use.
Keep it cheap to run, accessible, and respectful of people's privacy. Flag anything you are unsure about instead of guessing.