Another Liberal-aligned lobbyist firm, Crosby Textor's property advisory CT International and Corporate Advisory, has had Country Garden as clients since April last year among other developers, the registry shows.

The former Liberal Opposition leader, Kerry Chikarovski, also appears several times on the Department of Planning and Environment's register which lists contact between staff and lobbyists.

The register also shows Harry Hughes, the nephew of prime minister Malcolm Turnbull, became a lobbyist for property developers within a month of leaving planning minister Anthony Roberts' office in September 2017.

Mr Hughes, who was an advisor to Mr Roberts, registered Axis Strategic Advisory in October last year and lists clients, including Atilol Holdings.

Atilol Holdings owns a 125-hectare parcel of land called “Luddenham Hills” in Orchard Hills which is currently zoned for rural use, but the company is eager to develop it into “a new urban settlement”.

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The Opposition leader, Luke Foley, said there was a web of links between the government and developers that has become even more obvious since Mr Maguire's downfall.

“Given revelations about Daryl Maguire at the ICAC, the community is entitled to be suspicious about the intimate web of connections between property developers and the Liberals and Nationals," Mr Foley said.

“The Berejiklian Government has blighted many Sydney suburbs with over-development and the community is entitled to ask who has benefited from this approach.

“There needs to be an independent investigation into all of Mr Maguire’s dealings with property developers."

In the wake of the ICAC hearing, it emerged that Mr Maguire repeatedly pushed staff in government ministers’ offices for help to advance Sydney property projects.

The Herald revealed the disgraced former MP lobbied ministerial staff over a potential 25-storey residential tower in Campsie, and also over a parcel of land at Camellia on which more than 2000 apartments could be built.

Mr Maguire formally resigned from Parliament on Friday after being paid his $165,000-plus salary for several weeks despite having packed up his office and no longer representing voters in Wagga Wagga.

Several government sources said the premier's chief of staff, Sarah Cruickshank, told staff this week that a byelection is likely to be held on September 8 or 15, depending on when Mr Maguire resigned.

"The only reason any of this information about lobbyists is available is the NSW Liberals and Nationals passed the Lobbying of Government Officials Act 2011," Mr Roberts said.

"No one knows who was lobbying the previous Labor government. I've taken steps to insist the Department of Planning and Environment keeps fastidious records of contact with lobbyists and they ensure they are published."