Change of ownership can cause them to be called without consent.

They are not allowed to do any repairs or modifications, none, without written consent.

This will help you be better prepared.About the "upgrades"... many tenants think they have made "improvements" to the property in the course of breaking property rules and making changes without the landlord's consent.  

First I contacted the attorney who represented the bankrupt tenant (tenant A), he said that once the tenant A filed bankruptcy, the lease would be automatically rejected, which mean I could proceed any further steps without tenant A's consents.  

The ethics and laws are much different, if you deal with real estate as a widget of personal property you have the wrong mind set to be in real estate.If you have a PA contract with a seller that allows the seller to consent to an assignment, you have a listing agreement, you're putting yourself in a position to act on a seller's behalf with their consent, now you are a broker!

What worked for me was partnering with a trusted local business or coworking space in the area and using their address (with their consent, of course).

Disclosure form lists the address as: Development Name Lot #, Desirable City, Zip of less desirableAgency Consent and Purchase Agreement list Street Name, Lot #, Desirable City, State + Zip.

The 4506 -T does require the SS# and signature of the person whose return it is (as you'd expect- I certainly wouldn't want just anyone being able to request a copy of my tax return without my consent...).

You might have to get a parent sign off but most places let you work as young as 13 or 14 with parental consent. 

EIDL loans are likely to require consent as they will be secured debt.