You need to get special permission to buy land from the secretary and this while policy only applies to the land you buy afterwards not previously owned land .
Imp : The provisions of Sub-rule (1) does not prevail if any foreign citizen of Nepali origin has received any immovable property in the status of a Nepali citizen.

(3) Any foreign citizen of Nepali origin if intends to purchase the land or the other property pursuant to the Section 10 of the Act and Subrule (1), shall submit an application
If the application has to be submitted pursuant to Sub-rule

(3), the secretary shall give the permission to purchase the land and other immovable property within Nepal