What kind of land was it, agricultural, residential, forest etc..?
And how big was the plot?
A foreigner may purchase real estate only after receiving permission from the Ministry of Internal Affairs and Administration (after approved by the Ministry of Defence and, in the case of farmland, also after receipt of approval by the Minister of Agriculture)
From the day of accession to the EU (1 May 2004), foreigners who are citizens or entrepreneurs of the EEC countries do not need permission to purchase real estate...
Exceptions to the above are:
1) Farms and woodlands - permission is required during the first 12 years from the date of Poland's accession to the EU. However, permission is not required if several conditions are fulfilled: if the person who wants to purchase the real estate is a leaseholder over a defined period (7 years for western regions of Poland and 3 years for the remainder ... and if the leaseholder personally conducts agricultural activities and lives legally in Poland
2) "Second House" - permission is required during the first 5 years from the date of Poland's accession to the EU (however, permission is not required if a foreigner lives legally and continuously in Poland for 4 years or if he purchases a "second house" in order to conduct business activities in tourism services
https://polishforums.com/real-estate/poland-foreigners-buy-houses-34820/