Continuing on from my example above, it appears that it would take ages before I could get IP2 for $250,000. From what I can see, I need:
If rent increased 5% p.a. from $475 to $735pw in 10 years, i.e. an extra $260pw
Rent on IP2 could be $250 per week
($260+$250) x 52 x 5 gives a loan of...