You would need to make sure the lender has releas clauses so that you could sell each property. It could make it harder to sell if you didnt have this.
Discuss with your CPA
Much tougher. There are very few commercial lenders doing these. A few portfolio lenders are but costs are high. Some local banks will still do this if you live in the area where the proeprties are located. They may not need to blanket them. Each one could be done as a commercial business loan.
The range depending on what type of financing source can get it done. Usually from mid 6s to low 8s. Not likely you'd get something with over 20yr amortization. If so, rate would be on the higher side.
Still open for discussion. Fannie baiscally says that they wont count as long as the title and loan are in the business name. Some lenders that sell off to Fannie/Freddie have their own internal guidelines that say they still will count if using a LLC but not a C corp.