The other solution is a portable AC but those are really expensive.

🤑Now I just need to get her a little portable paper shredder so that she can shred all my competitions ‘We Buy Houses’ postcards 😂  

During those 2-3 days the best we could do for tenants was to provide them extra fans.Can someone recommend a portable/Window AC unit which can be install quickly without a technician?

A portable AC unit is $200.

Use a fan or a portable AC unit if the reason for the open windows is that it is too hot.Trying to chase all cracks and sealing off your unit in a 1980s building will be mission impossible.

Can you explain what real estate portability is compared to reciprocity ?

Initially sub's insurance denied the claim stating the GC was responsible to provide portable toilet per OSHA regs.

Also AC's, sometimes they sneak in a portable roll around type or cobble a window unit trying to hide it.

I could see a wedding with portable toilets pissing off pretty much everyone within a few blocks.

You will need to include: temporary insurance costs, title costs, cost to store materials, how you will skirt around supply chain, portable office/fencing/potties, change order costs, number of months your construction loan runs and do you have a separate permanent take out or roll over -those costs.