@Bing Lin - I would look for the office CBRE, Cushman Wakefield, Colliers, etc brokerages and ask the brokers what kind of leasing volume they are seeing, as well as appetite for area, terms, style of office, etc.  

The leak occurred during excessive rains. 

California charges a minimum tax of $800 a year per LLC, and more if you have gross receipts in excess of $250k.

Hello,I had a tenant last winter and the heat in his unit was supplemented by the unit above him.It gets really cold down there in winter but he chose not to have free heat and sealed the vents tightly with an aluminum foil without  letting me know , I could have easily adjusted the thermostat to lower  per his needs if he had told me and supplemented my apartment above with any additional heat but he chose to seal without letting me know inspite of my warning later on and obviously it can have detrimental effect on the tubing inside the walls due to excess pressure build up.He also complained about high electricity Bill's (obviously he would incur high utility bills when he turns on his electric radiator without using the free heat he was getting) I ended up having an oversight from my end as I did not verify if sealing vent caused any damage . 

This does seem excessive, especially for labor only jobs.

If the foam is deteriorated you could cut away the expanding foam as best you can and get another can of it and refill the gap, then when it's dry cut away excess.

The contractor ended up bringing receipts at the end of the project that were $40k in excess of the $80k they had budgeted for rehab (so he said rehab cost $120k).

The specifics of the deal and the appetite of the municipality usually dictate which path is best.

Now that the Sellers have moved out, we [Buyers with Agent] took pictures of damages that weren't there at closing (e.g. broken baseboard, excessive holes in walls, mold in washer, etc.). 

But as @Theresa Harris whatever can put excess cash in your pocket to invest with is a good job.