This stuff gets complicated and depends a lot on state and local laws.

You might want to put a garage back there.

Does the city currently maintain the street? Who uses it? For what? If the street becomes partly your property, will you pay more tax?

Too many variables for a simple answer. Yeah, an experience real estate agent who knows the area would have some relevant views.

Currently there is no street there, it is undeveloped, the street terminates about 1 block from my property. However, this does not preclude the city from extending the road as the area develops and more houses eventually get built.

Ask whether you are grandfathered in on any zoning advantage/autonomy. Ask if any change subjects you to newer ordinances, which may lessen your control/rights on your property.

not a shady TSF following fascist maganazi, who might contact your solicitor for an inside information payoff to screw you.

My apology for sounding coarse. I just don't trust anyone anymore.

all the local real estate agents are fascist, greedy assholes.

Someone wants it for something and not knowing or thinking it’s not being used so what to do, I would get advice and sit on it for a while. Is this parcel included in your strap number/ property ID? Be careful with real estate in Florida…people come from all over with schemes and scams

I've lived on this property since 1964 (I was one year old when my parents bought it and built a house)

Talk to zoning, and a lawyer if you can't figure out the implications for this. It sounds like the neighbor wants to add to their lot, which may be substandard, with the goal of splitting the lot and/or building another house on the rear of the property. Is the easement impassable and not maintained by the city/county?

correct , the easement is unpassable (by car anyway, you can walk through it if you're careful) and it is not maintained.