Lay out plan of chbsl PREET NAGAR new Delhi 110092

I need your help.madhuvan,nirman vihar and PREET vihar societies were allotted land almost simultaneously in 1978.
The development of roads, parks, water and sewage lines was done according to DDA sanctioned layout plan
A block PREET vihar was separated from Madhuvan as 15 ft service lane was provided which runs at the back side of Hno 68 to 77 and merged by school in their plot.
DESU erected poles for electricity which now are in school plot.
Even doors of houses mentioned above are opening in school plot.
School came into existence after 1984.
Sublease of school plot and layout plan of PREET vihar will clear this situation
hearing in the chairman PGC is on 14/07/2010
kindly help.SOS