This is Hatfield House, at the North side of the Golden Lane Estate, EC1.
The arches in the middle of the picture are above the Golden Lane Leisure Centre, which is closed at the moment. You can just see the blue vending display, which has goggles and other items for use in the swimming pool.
While I was drawing the picture, I caught movement in the side of my vision. A man appeared below me, indoors, by the side of the swimming pool. I looked at him through the window. He was fully dressed, with covers over his shoes, stirring a bucket with a long pole. After a long period of patient stirring, he poured the contents of the bucket into the swimming pool. Then he refilled the bucket, set it on the edge of the pool, and started stirring again. At that point I stopped watching and resumed my drawing. When I looked back again, he had gone.
This picture was drawn for a commission. I made a preliminary drawing, and various sketches. Here is work in progress. The big challenge was to get the perspective lines right, to show the depth and distance.
This drawing was done on 29th September 2020.
Here are more sketches in the Golden Lane Estate: