The building matter of the circle/Region is handled by AD (Building) and SSPo had done the right thing as far as asking the information from AD (building). However, the onus of replying to you solely rests on SSPO and not on AD (building). In case there delay in reply, you need to file the complaint with the
CIC directly and not the 1st Appeal as per the
RTI Act.
However, while fixing the responsibility, AD (building) would be equally liable for the delay in response, if of course AD(Building) is able to justify the delay.