Material breach of rental agreement is easy to proof; however, it is something that can be fixed with reasonable effort or expense, while keeping the contract in effect, it's less likely to be material.I am aware that the California eviction process is simple, however it certainly becomes complicated once the tenant decides to challenge the eviction.Any insight would be greatly appreciated.

I'm thinking 25,000 in material costs for me to do the work.

Call the city planning department, tell them you need a curb cut and find out what the requirements are to get the curb cut and what materials are allowed for a driveway.  

I am looking into his stuff as well as the material that Paul Moore/Al Williamson does with AirBNBs.

However, you already gave him money that he spent and does not have to pay for the materials on your job.

I did a remodel on one of them when I first bought it - did everything myself - Home Depot quality materials - and did it for about $6k.

You need to know what you value in your current situation.Values such as: Price for quality in labor and material, or If holding costs are an issue perhaps duration to completion.As far as quality goes, do you want the 'Best of the Best'(out of your options) for your investment, or is mid-range quality OK.

Doesn't necessarily need to be something monetary but even the possibility of hiring them for your properties could be value.After a couple times of doing these, you'll have a better understanding of the process... but there will still be variables (labor, materials, your exit strategy also carries weight as well, whether you're going to fix-and-flip to a retail buyer or rent it out.)

The GC believes his costs will average around 30-33% of market value as his reasoning for pricing is 33% Material, 33% Labor, 33% Taxes.What is a reasonable % of equity you would offer a GC?

How high you can go up on such a small size parcel can make a big difference in returns.If the buildings are old the procedure to tear them down could get expensive.Also tenants on current leases the disruption to their businesses would likely need to do in stages more (start and stopping) with development and meanwhile labor and material costs can go up.