ATO ID 2010/162
Superannuation
Self managed Superannuation Fund: limited recourse borrowing arrangement - borrowing from a related party on terms favourable to the self managed superannuation fund...
I beleive a member can lend money to the fund. However security over the SMSF assets cannot be taken.
You should also consider whether it is in the best interest of the fund for it to be sinking so much of its funds into one property.