I have a network and will be having those conversations but what the books don’t teach, and what I haven’t found here are specific terms. 

A fourplex full of long-term renters. 

Generally speaking, the responsibility for repairs like this depends on the lease terms and local landlord-tenant laws.If it was a malfunction with the lock (wear and tear), it could be considered the landlord's responsibility to cover the cost, since maintaining the unit in a habitable condition is part of our duty.

Upstate New York and Florida have both caught my attention, but I’m uncertain which market aligns better with my long-term goal of building a portfolio of multifamily properties, specifically quadruplexes.

Get seller concessions to buy your rate down and pay your closing costs, so you can save your cash.

If one of your prospective tenants has an EV, you can offer to split costs to install it as long as it stays after they leave. - could be a creative solution

Long term I'd like to have more in the Poconos due to my familiarity to the area as I grew up there.

I'm looking to get started in a long-term rental, even a perhaps a small multifamily in a B-/C+ class-ish property. 

Do you mean actual cash value?

to buy land and develop RV Park for long-term guests and/or self storage...