You can enter into agreement with seller .he can apply for conversion of land into NA
2) inorder to buy green belt land you must satisfy criterial laid down by karntaka land reforms act . admittedly you r family income is more than Rs 25 lakhs . hence you cannot buy agricultural land in karnataka
3)
as per Section 79 (A), 79 (B), the Green belt land can be bought only for the purpose of "educational institutions recognized by the State or Central Government" ,
4) Section 95 (3B) of the Karnataka Land Revenue Act specifically prohibits the Deputy Commissioner from granting permission for conversion of land in the green belt for any other purpose. So no land in the green belt can be converted. However, as stated above, under section 109 of the Karnataka Land Reforms Act, certain lands may be exempted from the provisions of the act and allowed to be used for the purposes of putting up industries, schools, low income housing, etc. So although lands in the green belt cannot be converted, certain types of activities can be exempted, provided special permission is procured. The lands can then be used only for the purposes for which it was exempted.