You can have certain events of withdrawl of any memeber, say upon the filing of bankruptcy.

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Talk to divorce lawyers, probate, lawyers who handle REO property for banks, bankruptcy, etc. 

Doorknocking, or build a doorknocking team.Leverage strategic relationships -- agents (foreclosure, short sale, probate/estates), attorneys (divorce, bankruptcy, probate), CPAsYou're in San Diego, call up all the cities in the SD area and ask if the RDA (Redevelopment agency) has any left over projects that they plan to liquidate.

I've personally evicted a tenant and gone through the bankruptcy courts when a tenant who I was evicting filed bankruptcy.

See this excerpt from our rental criteria:FINANCIAL/CREDIT HISTORY1.No outstanding debt to previous rental property owners.2.No outstanding debt to utility companies.3.No outstanding debt in excess of $1000 that is not in a payment plan.4.No excessive monthly financial obligations - more than 20% of income.5.Lack of credit history or marginal credit history may result in additional security deposit. 6.Derogatory credit (past due accounts, collections, charge off accounts, tax liens, judgements in excess of $1000 and/or bankruptcy) may result in additional security deposit or denial.

Bankruptcy is one.

Some of the more commonly seen situations are: borrower has sold the house; borrower has declared bankruptcy and has actually filed paperwork to receive the automatic stay of all legal actions; forbearance or loan modification is being put into place; borrower has provided the judge with some reasonable defense motion that requires the lender to re-start the process.

It might have been that they were trying to avoid bankruptcy or foreclosure, they had a baby on the way, a relative got sick etc.

Not only do you need a real estate attorney but you also need someone with experience in creditors rights and bankruptcy issues.