The developer said when we signed contract we can close in less than 45 days now they are saying we can’t but won’t give us a firm closing date.

Be firm, be fair, document everything in writing, and don't lose sleep over it. 

You should have a hard and firm rule about occupancy. 

But in either event, I would just hire a pest control to spray the premises for a low rate and I would notify the tenant that they'll be responsible moving forward as your doing this as a courtesy.If you feel inclined, stand firm on your beliefs.

@Jordan McNellySee if you can get some experience working with a firm the specializes in real estate taxation.

His firm is called Small Business Legal Centre. 

Regardless, firm but far is the most important thing to do as landlord.

I left my job at a top strategy consulting firm in NYC to do this full time, so I have had the time to think (probably too much) about this.I have a strong opinion on the cabin rental programs-- for instance- I closed my first cabin on July 2nd 2018. 

What company/broker firm would you recommend to join? 

They need experience in this space (adaptive re-use or work with commercial interiors) This can also come in the form of an integrated design/build firm.