Prims

[NayNayFaith]

Is it possible to buy more prims/space on a land you bought? 

[Rolig Loon]

The quick answer is NO.  The Land Impact capacity of your land is defined by its area.  If you want more land impact capacity, you have to buy more land.

The more complicated answer is that under some rather rare circumstances, the landowner on a private estate can add a bonus to the L.I. capacity of some parcels at the expense of L.I capacity in her own land.  The total capacity for the region remains the same, but the landowner has redistributed it carefully to give renters a little extra.  (For example, that's how Linden Lab gives parcels in the Horizons regions a bonus.  If you have bought land in Horizons, you get more L.I. capacity there than you would normally get elsewhere.)

[Lindal Kidd]

With some Mainland rentals, the landlord will rent you extra prims in return for increased rent.