There is an asphalt road connecting to the parking garage. Also, along the road outside the garage are 9 street parking spots that are for rail trail use only, limited to four hours. Between them and the garage are two van accessible handicapped parking spots.

Attached photo(s):
https://streetcomplete.app/p/376184.jpg

Parking is paid, $4 per day

Can't answer "What are the opening hours here?" for way/229121345 (Ayer Commuter Rail Parking Garage (Multilevel Parking Garage)), via StreetComplete 64.0-alpha2:

Overnight parking for customers only, no overnight parking of RVs or campers

Attached photo(s):
https://streetcomplete.app/p/376183.jpg

Sidewalk west of here

Only one road

Attached photo(s):
https://streetcomplete.app/p/375060.jpg

Road only divided between here and Main Street, not divided to the south

Crossing

Attached photo(s):
https://streetcomplete.app/p/375059.jpg

Crossing, and sidewalk continues

In overlay "Buildings" for way/212119263 (house number 601;603: Building), via StreetComplete 64.0-alpha2:

This building is only 601

In overlay "Buildings" for way/212119270 (Building), via StreetComplete 64.0-alpha2:

This building is 603