A Spaceship Cloud

Sighted a very strange cloud formation out my window this morning.  The way the sun was leaking through the cloud, it looked like a spaceship hovering over the neighbourhood.

Farther away, other leaks were happening as well:

Here's a close-up of the cloud:

It slowly moved so it appeared to be hovering over this building across the street:

(I was rather alarmed by the spots on these photos but I think, I hope it's just a sign of a dirty window rather than moisture drops on my camera lens! No sign of them on other recent photos, so I think all is well.  In the meantime, at 14 floors above the ground, I'm at the mercy of the wet weather until the building management hires a window cleaner in the spring!)