Poor guy!
GST does kill small businesses. This guy is going down. At $900k, there's no room for negotiation My mum only owed the ATO $20k and they still took her business. Infact, she owed no one else money and ATO was her only creditor.
Not all landlords are as nice as you.....my mum's landlord doesn't have the time and day to drop by for a free meal! she only corresponds with him through his solicitors.
Hopefully everything will work out for you though. I am sure it will. :)