How maintenance works for row houses

[Oscar Beteta]

Hey guys, how does maintenance work in a row house?  I've never owned a row house but I'm contemplating buying one from a foreclosure auction.

I don't know how exterior maintenance generally works for this property type.  For example, who pays for fixing the front patio roof if the roof is a continuous roof for 6 adjoining row houses?  When the roof needs to be replaced, do all owner get together to pitch in to fix it or does every owner just fix the section that belongs to them?

I assume that some are managed through an HOA and some other are self managed by each owner? How can I check if an HOA is in place?

I looked up the property through the county property records office the land use is set as triplex.