So I’ve found a house that I would have to do some work to, but at the end would be able to rent it out by the room. This property also has a 15x30 ADU. I’d like to know if it’s possible to turn this into an additiona...

1) It is not yet clear but it seems that you will be grandfathered in at the time when the changes occur in regards to occupancy changes.2) Per AB-68:"(A) One accessory dwelling unit and one junior accessory dwelling unit per lot with a proposed or existing single-family dwelling if all of the following apply:(i) The accessory dwelling unit or junior accessory dwelling unit is within the proposed space of a single-family dwelling or existing space of a single-family dwelling or accessory structure and may include an expansion of not more than 150 square feet beyond the same physical dimensions as the existing accessory structure.

The biggest issue is regarding non-owner occupied single family dwellings.

Can I convert my car port which is connected to my main dwelling as a JADU?

I have State Farm and the policy type is "Rental Dwelling".

The selling realtor has claimed that those were mistakes and there are no issues with the dwelling.

If I rehabbed the attic, moved into that unit, would my 2 Airbnb units still be compliant with NYS multiple dwelling law (since I am living in the house)?

That policy gives additional coverage if the undlying policies (auto, home, dwelling/fire, boat, etc.) are exhausted.

That is on a DP3 (Dwelling tenant occupied) with wind coverage.

ARMLS has a category for "Multiple Dwellings".