When I started my company I did a search in DMOZ for "property preservation" and "Foreclosure Cleanup." I called every company in this list and I also emailed them consistently.
I also did a google search for "property preservation" and went page by page applying to property preservation companies.
I took advantage of the FREE method. It took more time, but if starting a new business we had little investment money.
Another method is to purchase a lsit of property preservation contacts.
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