The Treasury Department aims to complete a draft master plan for the use of its 12.5 million land plots this year in a bid to ensure efficient use of the land, says director-general Chakkrit Parapuntakul.
A survey will determine whether private-sector bodies and state agencies renting department land are meeting rental objectives.
The survey will function as a key test for consideration of rental fee hikes.
The department is also set to crack down on land encroachers by persuading them to become tenants before starting any legal process.
Nonetheless, the department will not let encroachers rent restricted land such as water source areas.
At present, 2.9 million of the department's land plots are encroached upon, mainly in Ratchaburi, Kanchanaburi and Nakhon Ratchasima.
Some 600,000 rai of the department's land plots in Ratchaburi province, and Suan Phung district in particular, have been encroached upon by area residents and hotel operators.
In Ratchaburi, of the 172 hotels that were alleged to have encroached on department land, more than 100 have become department tenants.
Mr Chakkrit said the department would hold talks with concessionaires on 10 large-scale and unsettled property development projects to reach resolutions by the end of this year.
These include a long-stalled Mor Chit development project on 63 rai of land, the expansion of Queen Sirikit National Convention Center and a project to develop the 19th-century Customs House on the east bank of the Chao Phraya River.
Separately, the department plans to complete appraisals of a combined 30 million individual land plots by next year to enable the land and buildings tax to take effect.
The Treasury Department has appraised 7-8 million land plots on an individual basis, and it aims to assess an additional 7-10 million this year.
The draft bill for the land and buildings tax, which is likely to go before the cabinet in the coming months, sets maximum rates of 0.5% on land for agricultural use, 1% on land for residential use and 4% on land for commercial use.
Unused or vacant land would be charged at a progressive rate every three years, not exceeding a maximum level of 4% of appraised value.