Need ideas on how a finished basement in NY can create income.

[Joanne Velez]

We have a finished basement which can be used for lounging/hanging out, storing things but not for sleeping.  As an apt it could have easily been rented for $1,350.00. Just wondering if there is a legal way that we have not thought of to create income.  I was thinking office space, but I'm assuming that would not be allowed in a home zoned as residential.