This of course assumes that it not on the drive due to the owner blowing the engine limping home and never getting round to fixing it, in which case a new battery, plugs and tyres are not gonna do a lot of good
You need to speak to the owner and establish if it is for sale, if so why it is parked up and then how much.
You may get lucky and get a bargain you may not but if you don't ask you will never know