Do Saudia sub let in Saudia city?
20 years is a long time..... No sensible person would actually pay to live in Saudia City these days !!!
Renting costs go from 15000 SAR for a 3 bedroom outside compound apartment to around 80000 for a 1 bedroom apartment in Arabian Homes - Sierra. There are hundreds of compounds in the city, so you should be able to find something to suit any budget.
For your sake, I hope you are based in Jeddah.
Cheers
Mutt