The New York City Commission on Human Rights has issued a Gender Identity and Gender Expression Legal Enforcement Guide.

You can read the whole thing HERE

Some key points:

• Most individuals and many transgender people use female or male pronouns and titles.  Some transgender and gender non-conforming people prefer to use pronouns other than he/him/his or she/her/hers, such as they/them/theirs or ze/hir.
• All people, including employees, tenants, customers, and participants in programs, have the right to use their preferred name regardless of whether they have identification in that name or have obtained a court-ordered name change,
• The Commission can impose civil penalties up to $125,000 for violations, and up to $250,000 for violations that are the result of willful, wanton, or malicious conduct.

You can be fined for not using the right pronoun, including ZE or HIR.  You have been warned.