Hah! gotcha!

Seriously it took around one and a half hours total including the color which was minimal. By far, matching where I was on the sketch with the building when I looked at it, was the hardest part.

It’s like looking up from reading a book, then trying to find the place you stopped again. The top row was slightly different that the rest and the front corner vertical set of balconies was different than the rest.

All the differences were subtle at this distance, which made them hard to pick up without a lot of study.

The trick:
Get an entire column of suites correct, then repeat for the next column until it changes. In hindsight, attacking it in rows might have been easier. Also, I laid it out in pencil, then inked it.

I would have been defeated by error had I only used ink. Or, it would have taken twice as long had I the patience to insure no error would occur before laying a line.

I would say it’s more impatience than spontaneity But hey, what’s the difference eh?

Once you become accustomed to sketching with crossed eyes it gets easier to tackle subjects like this.