When former Gov. Andrew M. Cuomo joined the New York City mayoral race over the weekend, he reintroduced himself to New Yorkers after years out of the public eye.

On Monday, he will start to introduce his proposals to improve the city, starting with a detailed plan to make it more affordable.

The plan includes plenty of ideas that could be popular with families: expanding free preschool for 3-year-olds to make it truly universal, creating free bus routes, building affordable housing and reducing taxes for some residents.

“With the right leadership, we will restore affordability and help ensure that New York remains a place where all have the opportunity to succeed and thrive,” Mr. Cuomo said in a statement.

Affordability has become a major theme in the mayoral race, along with public safety and the impact of the Trump administration on the city.

New York is facing a once-in-a-generation affordability crisis that has left roughly half of city households struggling to pay for basic necessities. Rents and other expenses have soared, pushing families out of the city. Polls have shown that voters are deeply concerned about the cost of living and creating more affordable housing.