Tax Lien Questions while researching

[Valery Mora Kepley]

I am looking up information on preliminary tax lien sales.  I am able to see the person who owns the property, then I am looking at the GIS for information on assessment and property location. I am hoping to eliminate some of the properties I look up. Here are some questions I have.

I have heard not to mess with Life Estates.  Would an owner's name listing "et al" be the same?

What if a property is owned by Freddie Mack? Is the government not paying taxes? Is there a chance it will be redeemed?

What is up with HOA common areas not having taxes paid?

Also, are there issues with a lot that doesn't have a number address listed?

Thanks in advance!