@Reya RipetI self manage my properties and executed several extensions this month for early 2022 lease expirations.

Further around here, many (probably most) plumbing and hvac companies pretty flagrantly ignore county permitting requirements for routine replacements of water heaters and furnaces and the like and even for more extensive remodeling work permitting requirements are often ignored.

I have already put a lot of money into this house more than I should have, I have created a list of repairs but how extensive should I go on making it look perfect?

Include a consequence for failure to comply, such as termination, automatic month-to-month extension at a higher rate, etc.

My electrician had to fix several “double tapped” breakers, a lot of exposed electrical wires (that had to be put into conduits/junction boxes) because of DIY repairs and “extensions”, and put in GFCI in kitchen and bathrooms, and installed a wall heater in one of the rooms.

On the 21st day, we decided not to pursue the purchase further due to some unexamined concerns and informed our Realtor to notify the Sellers' Realtor regarding terminating the contract or getting an extension.

I have a feeling Michael Scott filed for extensions and waited till October.  

The rent control law (aB1482) prohibits a LL from mandating materially changing a lease (ever) and provides the LL limited reasons for a no fault lease termination (move in immediate family, a renovation of the unit extensive enough that tenant must vacate, removing from the rental market, or government mandating).  

Also, there is usually an extensive Hold Harmless and Indemnification clause/section in the written contract with the contractor.You should review the requirements you will have for the contractors with your attorney to make sure they do not conflict with any local/State/Federal laws. 

I was sold in 2015 for $109,000 Damage is extensive; half of the property roof is missing.