Unable to answer "What type of barrier is this?" – Barrier (Unspecified Type) – node/40717095 via StreetComplete 58.2:

When I visited there only seemed to be traffic cones

Unable to answer "Is this still here?" – Nate Hartley Oil (Corporate Office) – way/361103911 via StreetComplete 56.1:

A condo building has replaced this

Unable to answer "Who is allowed to park here? Parking may be free or paid." – U-Park (Parking Lot) – way/410390723 via StreetComplete 56.1:

This parking is no longer available; condo building replaced it

Unable to answer "Is this still here?" – Brooks Staffing (Employment Agency) – way/361103898 via StreetComplete 56.1:

This block now contains an apartment building. Previous building was demolished.

Attached photo(s):
https://westnordost.de/p/197669.jpg

Unable to answer "Do you have to pay to park here?" for way/1101865856 via StreetComplete 55.1:

This appears to be two separate parking lots, one of which belongs to a business (the gym in the photo) and the other seems to be attached to the city park, and so probably has different rules.

Attached photo(s):
https://westnordost.de/p/190619.jpg