Stay away from Philly as their laws are as tricky as NYC's.I would strongly recommend you purchase something within an hours drive from you so you can learn on the job as a landlord. 

I have access to contractors, lenders, and have a very strong balance sheet, so just need to find the right deal and get access to comps.

If you’re renting an apartment building to mostly Section 8 tenants, the main difference from single-family or smaller multifamily properties is scale—you’re dealing with more units, so you’ll need solid systems for maintenance and tenant management.

I will also strongly encourage accessibility for pets as well. 

Make sure the lender you choose has a strong background in this type of lending...check them out on Linked In to see their experience level.

What are some companies that others are using to insure multi-families of this size?

The market has a lot of strong points right now: affordable entry prices, great rent-to-price ratios, and high demand for rentals, especially in the Section 8 space.What’s even more exciting is the direction Detroit is heading.

My current portfolio includes two 3-Bed/2-Bath Single Family's in my home state.

Here are some indicators to help you assess a buyer's seriousness:Questions: Serious buyers will ask detailed questions about the property, such as maintenance costs, neighborhood amenities, and property taxesStrong Offer: If a buyer makes a strong offer quickly, it often indicates a high level of interest and intent to purchasePrivate Buyers: If approached by a private buyer, ensure they provide a Letter of Intent (LOI) and proof of funds.  

Could be their parents or other family  members.