Here's an example process and timeline for New Jersey: https://www.doorloop.com/laws/new-jersey-eviction-process

If you need to obtain it, how difficult will that process be?  

In a city like Philly, you will face many challenges - you need to learn the market and know the neighborhood and the block and make sure all of your numbers are within reason, you need very reliable contractors, you need a to understand the permit process, you need to be familiar with market expectations. 

Quote from @Sami Gren: I start by making the original tenant fill out a form requesting to add a new renter, and they pay me a $50 processing fee (I charge a $50 fee any time I make changes to an existing lease). 

I am looking to make a couple connections now during the moving process.

Make sure it explicitly explains the process for termination if you are unhappy with their services, especially if they violate the terms of your agreement.3.

Starting with a smaller property or a few fix-and-flip projects can help you build equity, gain credibility with lenders, and better understand the process before scaling up.Securing funding for larger projects can be challenging without prior experience, but options like hard money loans might be worth exploring.

This will allow you to get the sheriff involved immediately.If you are already past the notice period then you will probably have to follow whatever state laws are in place for the notification period and possibly the eviction process.

I wanted to offer him about $50K over what is remaining on the mortgage and go through the 60-90 day process to assume the existing mortgage.

I was there a long time with the loan officer, explaining the whole situation and listening him tell me how the process worked (completely different than what Lee Arnold tells his Inner Circle students).