The seller assured me he would do his best to extend the lease I may make the a requirement in order for me to close

A friend from Church flips and mentioned this summer they were sitting on 6 homes for an extended period of time....essentially all summer, for no apparent reason even with price drops ect.

Would this just bring a cosmetic improvement or would it help extend the life of the viny too? 

And it extended for so long because there was too much market manipulation.

Generally, you want to inquire whether the contractor's insurance policy extends to workers and whether you are also covered when viewing a worksite.

You would also get an extra few months out of them because they are part-way through their leases right now, and if you make them sign a one-year lease for the 2-unit, you'll inherently extend their stay with you.

The supply expansion calmed home-price appreciation after an extended hot streak.

You may be able to extend coverage from a personal policy or a commercial policy as Jason mentioned.

We bought the extended warranty (60 months) also.  

Such as extended rail lines, express lanes / HOV, Slug parking lots, etc