Sefton Central Labour MP Bill Esterson and Lynn Gatherer from the Maghull Labour Action Team, met with the developers behind the Damfield Lane plans to pass on residents' concerns.
Bill and Lynn met with Priory Asset Management's Stuart Grundy and Estates Director Michael Hook to discuss residents concerns about their plans for building on greenspace in Damfield Lane.
The developer wants to build a 'care village' at the site.
As soon as Maghull Labour Councillor Patrick McKinley first found out about the plans back in August, he called a public meeting to let residents know about the proposals. Cllr McKinley was only elected in May.
However, it has since come to light that Liberal Democrat councillors in East Sefton had known about the plans for two years.
After receiving scores of correspondence from residents, Bill and Lynn organised a meeting with the developer to ensure that the concerns were being addressed.
Following the meeting, Bill said his role was to ensure that all concerns were addressed.
Bill said: "Since details about the plans came to light, the Maghull Labour Action Team and I have been contacted by countless residents with concerns about the plans.
"These concerns included drainage, sewage and flooding issues, loss of greenspace, footpaths leading onto private property and concerns about congestion. Mr Grundy and Mr Hook listened to these issues and assured me that they would do all they can to tackle these concerns. They gave me assurances that the scheme will improve drainage in the area, the plans have already been amended to redirect the problem footpath and they will be working on landscaping the whole site.
"They recognise the problem of traffic congestion around Damfield Lane and Deyes Lane, particularly at peak school times, but they say traffic surveys have shown that there will be approximately a 1% increase in traffic, the bulk of which will be outside the school rush.
"For other concerns they said they would go away and do all they can to tackle these concerns before submitting any formal plans.
"It is highly unusual for a developer to sit down and take the residents' concerns into account so it is good news that Mr Grundy and Mr Hook have been prepared to do so. But I have told them that the Labour Action Team and I will continue to speak up for the residents and make sure that the company is listening and taking positive action."
Lynn Gatherer from Maghull Labour Action Team said the residents had some valid concerns which the developer appeared to be taking seriously.
Lynn said: "Labour councillors Patrick McKinley, Maurice Byrne and Steve Kermode have ensured that residents have been kept fully informed about the plans from the point they found out about them. It's just a shame the Lib Dems didn't do the same two years ago when they first found out.
"During the meeting with the representatives from Priory Asset Management, Bill and I continued to emphasise the concerns which have been raised with us. Both Mr Grundy and Mr Hook took a note of the concerns and assured us that they would be addressed.
"The Maghull Labour Action Team will continue to ensure that Priory Asset Management listen to residents and make any appropriate amendments to.
"We will continue to work with residents to ensure that their concerns about the development of the community of Maghull are addressed."