that is very excessive. I pay $1320/mo. for my 680sqft 1bd here in Lake Forest, CA (near Irvine) and this is on the higher side. My rent went up this year by $100/mo. (8% increase) from $1220/mo. The normal rent increase is around 5% or so, 7-10% is expected in this market, 25% is absolutely outrageous!

Your landlord is an extremely greedy scumbag, take caution even if you move out he may rip you off in other ways.