In General originally all the lands are agriculktural lands . They acquired commercial Potency / house site potency accordign to the changed situiation of the area in which the Land is situated !
The Registration Web Site is showing the ladn as Commercial area as the Registration department treated the land as acqiuired the Commercal Potency for fxing the land value for registration of the land and Stamp Duty - The Registration Department can not say more than that .
If you want to convert the land from agriculture to Non Agriculture you can apply before the the Revenue Authorities of that are .
on the point - NRI can not purchse the Agricultural land - is to be answered by any Forien Excahnge consultant in this regard - let us wait any other Members opinion !