Hello, Rollo!
Legally and financially, this is unfavorable for you. If your property does not have any other potenzielle access to a public road area, each rear owner requires an official encumbrance (Baulast) on the road property, individually. Additionally, this must possibly be secured privately by a servitude.
I assume that this is a private sale. As a seller, of course, one has an interest in receiving the full €370 for these ~200m², but logically that is incorrect. The standard land value prices or the increase from agricultural/reserved land to building land results precisely from the fact that road areas and connections are constructed, and these costs then reflect in the increased standard land values of the (overall reduced) area for building land.
In short, you would be paying twice.
Such a communal/public road area can also be transferred to the city with all rights and duties so that the area counts as public roadway. This also replaces the more complicated construction of a jointly used private road and naturally saves on maintenance costs. The municipalities usually pay a symbolic price of €1 after completion... for the entire road, no matter how large. Because the road is paid for through the income from the sale of building land.
More precise information can be given with a cadastral extract; you can gladly upload it, censor/exclude the specific location designation, and only enter the ownership relations in the corresponding parcels, i.e., which areas are private/building land and where the surrounding public traffic areas (all of them!) are located.
Best regards
Dirk Grafe