Yes, you will need some plumbing and electrical work for your remodel. You cannot do a kitchen or bath without that, even if it's just disconnecting the sink and dishwasher. And because you are in a multi-family dwelling, all work on your condo will need to be performed by licensed and insured professionals. You will also need approval from your condo association for the flooring installed, as well as any other changes that will require work on a common wall. Often, getting approval from them will be more difficult than obtaining the needed permits from the city.