No saving or storing anything is required on the part of the landlord. 

Common uses include receiving/processing applications, tracking rental units, leases, tenant contacts, payment history, accepting online payments, maintaining documentation, and tracking maintenance.

I don't see any other applicable place for it.  

Raising rent to $950 and have 4 applications in 2 hours from just a placing a Craigslist ad with no pictures.

Get your furniture from thrift stores in nice neighborhoods (good quality, medium price) so you don't care when it needs replacing.It's totally fine to move the booking off Airbnb and book a guest directly (just don't double book yourself).

You don’t have to launch a full application for credit to speak with them remember. 

Then there's the transactional (deal-making) and litigation (deal-breaking) dichotomy within each area.There are some basic vetting that apply to all industries and some thoughts that are applicable to only lawyers.  

2). is this applicable only to Federal tax or state tax (california) as well?

Do you know if the application process is the same as painting?

Those changes are now codified at the state level for all of Oregon to follow by SB 291.Of note, Senate Bill 291 will require additional disclosures from the landlord in order to charge for applicant screening.