It ends when they AND their stuff is removed to the level that allows you to begin the re-rental process. 

Yes, I have been involved with several "mold" properties that still had high mold levels after remediation.  

Pricing and risk levels are about the same for the same type of stuff in either city.

At a high level, the system ingests raw documents from the recorder's offices, building permits, zoning permits, market data, and other auxiliary datasets.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

In addition, due to them being eligible for conventional non-commercial financing they typically have lower cap rate than 5 units and more.  

These neighborhoods seem to fit my goals, especially with their lower crime rates and potential for growth.Do you think these are solid options, or would you recommend other neighborhoods in the Philadelphia area based on the price range and focus on appreciation?

In my experience, the local banks are going to get you better rates and lower fees with their commercial loan products than the "DSCR lenders".

Sherman does seem interesting though because of the lower cost and growth potential.  

I can send you their contact info.Quick Tip - I would start with a range of offers (lower-end), that usually helps my clients get out of the analysis paralysis phase.