I have taken up a case of the ISS to study on the sustainable development
after its initial use in 10 years.
In practice, it will be very difficult to make full use of whole systems, I
guess.
Consideration of partial use by exchanging of standardized parts and
recycle/reuse of some modules etc...
As I am an architect, I would consider inflatable modules (perhaps re-using
the liquid hydrogen tanks) and also designing interiors including walls,
celing, floor and furniture and adapting japanese construction technology to
the design.
I would really like to hear other member's opinion about the re-use of ISS.
do you know also that Tokyo Disneyland wants to buy the ISS for a future
space attraction park?

I dont know the possibilities of re-using ISS, but it sound as a good idea,
as it is up their. Sren Nielsen

One problem: It's not all up yet, and it's looking doubtful that
it'll be built up any more than it is. Given NASA's record with space
stations, are there any bets that they'll get it right this time?
(ISS = "Incredible Shrinking Station")
Even if it got up intact, I doubt that anybody would want to buy it
for doing anything real. It's a dinosaur ("an elephant is a mouse
built to government specs" and a dino is a mouse built to NASA specs)
deliberately over-complex and over-expensive.