Jason,
"Lis Pendens" is Latin for "Suit Pending". It is not a suit in and of itself. Nor is Lis Pendens a lien, it is a notice of pending suit related to the property, that is all. The LP could be related to a recorded lien, like a mortgage or a unrecorded lien like a city violation for not cutting the grass. So the Lis Pendens can be a mechanics lien, it could be a loan foreclosure or anything similar that is claiming an interest in the property. Look at the names on the Lis Pendens, the platiff should be listed, is it a lender or a construction company or the IRS, etc?
See if you see any information about the lien in the title history of the property. For instance a mechanics lien would file Lis Pendens but you would see a notice of commencement for work that opened but didn't close because they didn't pay, thus they are proclaiming their suit against the property for the work. Your title attorney or title company should be able to help you with this. If you didn't order title when you bought your loan, stop reading this and go order it. See if you can get an opinion of title from an attorney if you are not good at reading the abstract.
Don't assume that any event on title is subsequent to you, make sure. Compare the dates. The date of the loan you own should be first in history.
Because you have not said who the parties are for the Lis Pendens, there is no way to say whether it is a concern or not. However we have covered that if you are in priority (first in history) and the liens are not government in nature like the IRS city, county or alike, you should be fine. Any title agent or attorney should be able to point out concerns when looking at your title report.
As the owner of the loan, prior to trustee sale, you are entitle to all of the unpaid principal balance plus all the interest arrears plus all of the advances on the loan both T&I and Corporate. You will have the capacity to give a bid which you are willing to take prior to sale, that if a bidder bids that number or more you will consider yourself paid off. In the event that a bidder does not at least bid to your number, then the property will revert back to you. Until you get your money, no one behind you gets paid a penny, except the office doing the sale of course.
Your property is in California which is a non-judicial state for foreclosure. It goes fast and is not all that expensive. If someone told you $100k, they have no idea what they are talking about. They Google'd the question or read the balance sheet cost to banks, which was $77k and is not the same as your question, I would presume.
You should be able to get to sale within 90 to 120 days from the notice of default unless some objection from the borrower arises. Be mindful of the tax bills that are due and that the property is not insured, those are your concerns now to protect your interest.
Regarding attorney fees be a percent of loan balance. No, never heard of that. Especially residential foreclosure. Balance has no affinity to the legal work. Most attorney's will list what they will do for their fee and the fee can be either per hour or per file. In California we have used both before, however many attorneys are reverting to hourly fees to not loose money on troublesome cases.