Free advice. Go to the the Los Angeles building department and review all permits for this property: http://www.ladbs.org. If you see no permit(s) for foundation work, you may reconsider your purchase before investing in inspections. Call me any time at 818-883-8816 if you have other questions.
You are wise to consider this issue. The only opinion you can really rely on is a qualified inspector. This may not be the general inspector who looks at everything. In a case such as this, you may want to have a specialist in foundations review your initial report and personally inspect the home. You'll pay a little more, but it may be well worth it if you seriously like the home.
reputable they may even offer a warranty. Check with the city to get a copy of the permit and you may be able to get the engineering from the city. See if it checks out with what the contractor told you. If you do buy take precautions as a home owner to keep water away from the foundations with proper landscaping and drainage, irrigation systems, french drains and rain gutters with down spouts that take the water away from the house.