Sefton Central Labour MP Bill Esterson has received a petition from residents in a Maghull retirement complex raising concerns about an "excessive" rental charges which they are forced to pay for the live-in manager's flat.
Residents of Mayhall Court on Westway contacted Bill raising concerns that they all were having to pay "too much" for the flat.
The £901 monthly rental cost for the manager's flat is split between the residents.
But many of the residents, some of whom are very elderly, now want the amount they have to pay slashed.
Bill has written to Mayhall Court's owners urging them to cut the charges.
Bill said: "In recent weeks I have been contacted by Mayhall Court residents with concerns about the rise in rent on the house manager’s flat, which now stands at £901 a month. I have asked the Consensus Business Group, which owns Peverel Management and Fairhold Homes, to re-examine this fee.
"Fairhold Homes calculates the house manager’s rent on its sale value. I have urged them to consider the market value of the flat, not the sale value, which clearly shows that this is around 30-40% more than the average monthly rent due on a flat in this part of Maghull.
"I have made it clear in my letter that this is in no way a comment on the services provided by the house manager. However, the Commonhold and Leasehold Reform Act (2002) protects leaseholders against unfair charges and I have reminded the managers of the company that they are prevented, by law, from charging residents excessive rent for profit on a house manager’s flat."
Bill said he had heard from lots of residents, some of whom were struggling to pay the increased charges.
Bill said: "Some of the residents in Mayhall Court are very elderly and they are clearly getting from anxious about the costs. That is why they have come together and have put their names to the petition calling for a reduction in rent on the house manager's flat.
"What the residents have called for is for the charges for the manager's flat to be brought down to the average monthly rent for the area.
"I am passing that petition on to the Consensus Business Group who I am please to say have assured me that they are investigating the matter.
"I want to reassure anxious residents that we are working on this issue and urging Mayhall Court's owners to think again."