not cheap at £3500 with that milage,check for chain wear on underneath of swingarm,so often overlooked on these,a lose chain eats the swongarm to dangerous levels and is never noticed,check cush drive bushes as with high milage these pull out and wear the eccentric hub adjuster away,very costly,if its been used hard with slicks check the rear wheel holes on the mounting pegs are not elongated,rairing damage?
check radiator is straight and the oil cooler is not wrecked especially at that milage,they usually are.plus the usual bits and bobs,belts and heads last serviced,