You can get some estimates from contractors for what they charge for big ticket items like to renovate a bathroom, renovate a kitchen, replace the furnace, replace the roof, etc.All wholesale deals should have free and clear title and you should be able to see the sales agreement before submitting the earnest money deposit.

As expenses fluctuate (property taxes, insurance, maintenance items, etc), the cash flow is up and down and unreliable.

The AP has to be open, notorious and hostile...those terms have a legal meaning and essentially it is that you as the owner have been fully deprived of your right to the property.Absent those items above, it sounds like at best they have another legal right which is a "prescriptive easement".

Do negotiation with the tenantIf it is item 2, what are the do’s and don’ts

I have been using Appsheet for other items and can create something I can send the tenants.Thanks 

This way I get paid upfront for my work 1-2k plus I know I have another payday at some point in the future if the deal closes.The costs to fully develop a property and sell for near retail usually involves the costs below and takes 2-6 months or more in some cases, but the profits can be huge if you're working in markets where land costs are high:Title 200-400Legal 500-2000 depending on zoning issuesIf wetlands are present AND its a buffer zone project: 2000-5000Perc & septic design if needed 1500-3000Treescaping & cleanup for retail sale 500-1500Selling costs of 6%I tend to stay clear of properties that need more than the above expense items.  

Another thing we do is check to see what items need to be addressed.

The other contractors that I have worked with gave me a full scope with detailed line items of what will be fixed, how much the labor is and how much the material is going to be.

As expenses fluctuate (property taxes, insurance, maintenance items, etc), the cash flow will be up and down and unreliable.

Just to name a few items.