K K Goyal, Deputy Commissioner of Ajmer Development Authority, had demanded the bribe from one Fehjaan Hussain to regularise the plot.
The matter was pending with the officer for the last one and a half year.
The complainant came in contact with his middleman Rohit Jain who demanded Rs 60,000 for the work.
"During verification of the complaint, Jain took Rs 20,000 from the complainant and handed over to the officer.
He said the trio was placed under arrest.