The increased land value is because the land is more desirable. If I buy some land next to a rubbish dump, it's cheap because living there is terrible. If the dump is then closed my land improves in value, and I derive value from that.

Likewise if I buy somewhere cheap in a backwater town, and the town becomes more desirable because there are better employment opportunities, better shops, better amenities, all of which serve to mean people will pay more for the land, then I benefit from that immediately.

The value is subjective, if you lived in a quaint town and now it’s become a bustling place it may be a nightmare for you , despite the price increases. That is actually a win win situation, though, since you can now move to another quaint town elsewhere while taking a pile of cash with you, with the perhaps important caveat that you do lose your proximity to places and people you may consider more important than the money.