Demand for property is not the only thing that depends the property price. As Sanjay said, development in infrastructure and prime location or a new shopping mall, entertainment center etc can also play vital role in increasing the property price. Beyond these RBI key rate can also influence real estate price.
Properties are getting costlier because many factors like upward revision in development charge, revision of sector rates, based on water supply, increase in circle rates, etc. Improvement in infrastructure is also one of the factors, for eg., widening of expressway roads, constructing bridges, widening several internal as well peripheral roads, construction of flyovers, new group housing scheme. All these factors add up to increase in quality living but still there is decrease in demand.