noise from lift

my wife and i are NZ seniors and have recently moved to a newly-built boutique apartment in inner west which we bought off-the-plan to be near to family.  it is a four-storey block of a total of 20 apartments with a common lift.

our unit on the top fourth floor is separated from the lift by a concrete block wall.  when the lift is in action, we could hear its rumbling within the bedroom.  re-positioning the bed does not help.  the worst part is either we are retiring or about to wake up when the traffic is at its busiest.

the engineer has fine-tuned it but the noise prevails between 35 to 55 db.

we have suggested to the developer – cc the strata manager –  to do some acoustic treatment inside the lift chamber but there is no response.

this is the first time we live in an apartment in a new country and we are lost what to do next in such circumstances.

i welcome suggestions and advice.  thank you.