You need to either escalate this through the municipality and hold back rent OR call the police and report the tenant for disturbance.

What are the best strategies you’ve used to minimize this risk and keep projects on track? 

We are working with an agency in Mazatlan and it seems like this will take FOREVER and we are urgently trying to sell it due to some financial difficulties.Any advice will help,Thank you

This would be ideal in terms of cash flow (after a few years) and equity appreciation since you'd be achieving tremendous returns on limited equity in the form of appreciation, principal paydown and tax benefits aside from only cash flow. 

Hope this helps. 

Creative financing, partnerships, or shifting to long-term appreciation rather than strict cash flow might also help in this market.

- whoever reads this.

Can anyone help with this? 

Was this without permits?

This could lead to a huge tax bill and penalties.Think carefully before you do this.