Hi Mate,
I looked at the files and did an import with S3D.
Edit the MTL as you did the other building.
Blender is doing an oddball job on MTL things.
Why they would code it to do it that way is beyound me.
Add the cement texture to the assigned textures in S3D before importing your adjusted mesh.
You'll need to move the assigned textures in S3D up or down to get what you want.
I also saw that the original mesh has a few inverted faces so you may want to flip those.
And you may want to adjust the original UV's as the streakiness seems to be a weird UV layout when a different texture is used.