Right. I was a real estate agent in a past life. I was licensed in PA & DE. The laws were different in each state. Sometimes the exact opposite. Delaware says you need a permit to finish a basement but thousands of homeowners have finished their basement without permits and - usually- have no problem. But some do, and then sometimes the county doesn't have a problem but the buyers insurance company does. No insurance, no settlement.

There were a couple houses that I sold multiple times and sometimes what didn't need a permit or closed without one suddenly needed a permit 2 years later. The seller would look at me since I helped them buy the house. I'd have to explain that I wasn't the one who made the rules, enforced the rules or could get around the rules. They still blamed me. :-).

I would wait and see if it goes away. either way the end result could be tearing it down. at best they forget about it,

It's not going away.

When OP goes to sell the house, buyer will need a survey for bank. Then it's a big problem, with closing delays and lawyers involved.......

Not that big of a problem. The buyer may want to bulldoze the place and put in a parking lot. Or, just not care that a porch was not blessed by the city.

The first house I considered buying had an unpermitted addition. I asked the seller, he had just purchased and received the permit for the 8 y/o addition. At the time I did not know one could do that. --yeah, it's more money grab.