I need to find out the monthly rent prices of a tower block appartment in St. Petersburg (centre and suburb) right now and and in the year 2003.
Could anyone help me?

Haven't you asked this before?
You will be in trouble. Everbrite does not like this sort of disorder here.

i did not state specifically that i was looking for MONHTLY rent prcies. it is a long time ago, too.
You didn't get any too many answers then. Why expect that you will get some now? Just because you clarified that you were looking for monthly prices won't make a difference. There are too many variables - how big an apartment, how old a building, has it been renovated, etc.
Don't expect too much. Instead try looking at Russian real estate websites and contacting them about costs now and 5 years ago.
Ruth