Plymouth Land Registry staff face privatisation
Hundreds of civil servants working in Plymouth could see their jobs privatised.
Some 650 staff work at the Land Registry at Derriford.
The government is considering privatisation with three options - creating a government-owned commercial company, setting up a joint venture and full outsourcing to the private sector.
Unions said the move would lead to "worse pay and conditions" and a worse service for the public.
The government said it would lead to a better service and more flexible pay and recruitment.
The Land Registry maintains details of land and property ownership in England and Wales.
Business minister Michael Fallon said: "Giving Land Registry more flexibility to operate in the modern world will enable them to become a leader in digitising land and property services and support economic growth in the wider economy."
Dave Franklin, of the Public and Commercial Services Union, said: "I'm concerned about fewer jobs, worse pay and conditions and a worse service for the public.
"If you employ people of a lower calibre on lower salaries they will do a worse job."