It says the town is only 160 acres, and half is open space. The homes are huge, they probably don't rent to anyone.

There are fifty million rentals.

https://www.trulia.com/for_rent/Arden,DE/

Maybe you should delete this?

Arden is far from a city. Its a village n not even an official place. Places for sale wouldnt use arden, theyd say Wilmington or claymont. Theres no zip. Very small part of philly burbs of no de

No idea why no rentals, but apparently the land can't be sold:

https://archive.fo/mZlPp

Land in Arden cannot be sold; instead it has a renewable 99-year lease. The leasehold interest in the land has a market value and can be sold. People are free to improve it as they choose, but the land-lease fee will not increase because of improvements. Arden is not exempt from New Castle County land taxes, but the buildings within the village are taxed separately for county and school district revenue, while the land is technically one large parcel, and taxed by New Castle County accordingly. The land is held in a trust, administered by three elected trustees, who have life-long tenure. Arden's tax structure is currently based upon the individual leaseholds. Most leaseholds are residential, and the land rent is based upon the square footage rather than the improvements upon the land.

I get a creepy Harvest Home vibe from this place. https://archive.fo/JbX8k

Maybe because of all of the tunnels under the houses and churches and other buildings.

Could spook new home owners and blow the whistle it would be.

Also, they probably are not letting any people buy in.