from https://www.yangforny.com/policies/basic-income-for-new-york-city

Any New Yorker, regardless of their immigration status or life experience (ie. past experience with incarceration or the criminal justice system, experience of homelessness), will be eligible to receive cash relief.

New York City’s basic program will be supplementary to any benefits that New Yorkers currently receive and will not be categorized as “income.” In other words, New Yorkers currently receiving SNAP, TANF, Medicaid, housing assistance and more would have no interruption to these benefits.

The Yang administration will invest $1 billion per year in cash relief, making this the largest basic income program in the country.

plus

A Yang administration will launch the largest basic income program in the country. Through this program, 500,000 New Yorkers with the greatest need will receive a basic income that will help give them a path forward. Our goal is to end extreme poverty in New York City by putting cash relief directly into the hands of those who desperately need help right now, ensuring that every household has an annual income that is at least above extreme poverty, taking into account the true cost of living in New York City.

This basic income program will start with providing those who are living in extreme poverty with an average of $2,000 per year. This program can then be grown over time as it receives more funding from public and philanthropic organizations, with the vision of eventually ending poverty in New York City altogether.

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This is similar to policies proposed by Guy Caron of the NDP in Canada and the Canadian Green Party. It's not really "universal" basic income but instead it's desinged more to make sure everyone has a certain floor to their income that is at or above the poverty line. Obviously a true UBI would be best but I think this would be a good start.