Last year, on my 9 properties I had negative cash flow after accounting for mortgage payments, etc.

Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little, maybe even negative, relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560 (almost 30% probability of default), little to no good tradelines, lots of collections & chargeoffs, recent evictions.

So usually, it's around 10-12 decent leads weekly from 3000-4000k of contacts we run. 

When I run the numbers based on these rents, the property operates at a negative cash flow.If I increase the studio's rent to $1,400 per month, the property becomes cash-flow positive.

I say "may" because while I have read about this in several places, I have not personally verified this to be true.I usually pay contractors by check the minute the work is finished and approved.  

If not, I most definitely would reach out to the tenant, introduce myself and ask if they are going to be out by the 31st or the 1st, I would communicate  to the tenant as if I know they were told they are expected to leave, otherwise you may find they "do not know" they need to leave even if they actually know they need to leave....In the case they claim they are not aware they need to leave, you would need to follow the laws in the state you purchased the property, usually you can find that info on the states judicial branch or speak with a landlord tenant attorney. 

Usually this triggers eviction.

They usually spend one day going through the property checking everything for a couple of hours and move forward.

What dollar amount or percentage do you guys usually look for in fix/flip properties? 

They usually say something like Pkg 5-dfw 28 llc, with 10-20 properties in each LLC.