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I learned the most when I got the answer incorrect and had to check why.

For example, is it standard to ask for first and last month's rent upfront?

When it comes to the CA landlord laws, check out this link. 

Check with a few banks and see what they offer!

As mentioned check in the driveway.

Check with your local zoning about splitting your parcel to create a new address.

The BP lender finder tool should be a great way to connect with some lenders but you might also want to check with some local small banks. 

Is there anyone who has 15 mins for a phone call/Zoom as a sanity check on this final offer?

He quickly trusted me enough to let me walk around and check out the house.