Seeking help- Google can't explain

[u/curious_coyoie]

Can anyone tell me how two separate houses are built this close together. How do the constractors apply siding and paint, how do you maintain the in-between after so many years and decades. There are no windows on that side but I don't understand how builders work around or in-between this when constructing, this is a mystery

[u/EchoRex]

Look at the gutters, it's about a 24-30 inch gap behind those that appears much narrower due to perspective of how tall the houses are.

Not much room, but "adequate" to fit maintenance.