He also accused Waikar, the MoS for Housing in the BJP-led NDA government at the Centre, of running six construction firms in suburban Mumbai, which he said is a case of the "conflict of interest".
However, Waikar rejected the allegations terming them as "wild and baseless".
Nirupam, who heads the city unit of Congress, yesterday moved Lokayukta against the minister, days after accusing him of "usurping" a 20-acre government land in Aarey Colony here, and sought demolition of "illegal construction" made by Waikar in a state-run gymnasium.
He claimed that "Waikar is running six construction firms under various names between suburban Andheri and Jogeshwari in K-East (municipal) ward. While the minister is the main partner in the firms, other partners are front men".
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"The size of turnover of all these (SRA) projects is Rs 1000 crore with a saleable area of 3.5 lakh sq ft. Most importantly, permission for all the projects was secured by flouting of rules and regulations," claimed Nirupam, a former MP.
"...But Waikar's conduct is the gross violation of the oath that he took as a minister. Despite being a Housing Minister he is running six construction firms, which is the fit case of the conflict of interest," he added.
Nirupam demanded that Waikar be sacked immediately and an inquiry be launched in all the projects.
"I am also demanding action against the SRA officials who helped minister to get permission illegally," he added.
Nirupam had yesterday filed a complaint against Waikar with Lokayukta for "misusing" his office and "exerting" his influence as minister in "usurping the land".
"I am out of city and will clarify my stand explicitly in a press conference when I return to Mumbai," Waikar told PTI.