"turn of the century period, style architecture." - It should be a hyphen between "period" and "style," not a comma.
"If, perchance a book should fall off a shelf and startle a patron I am amused." - I would put another comma the other side of "perchance."
" (Oh, hell who's kidding who, the dame is a fossil!)" - I would change it to, "(Oh, hell. Who's kidding who? The old dame is a fossil.)"
"Oh No, wait" - It should be a small n.

"If a few words suffice to make it bright" - I think this is maybe the stresses in the first couple of words, rather than the number of syllables.
"But mornings offer more, much more indeed" - I would take out "much more" so that it reads, "offer more indeed."
"They signify a fresh start, a new chance" - To make this sound more poetic, I would change it to, "They signify fresh start, new chance." This would fix the rhythm, too.
"To embrace the day, to truly come alive." - The rhythm is a little uneven here. I would change it to, "To embrace the day, truly come alive."

"being anight watchman." It should be "a night watchman."
"her parked car.Has he had a haircut?" - You missed the space between "car" and "Has."
"Two aproned figures shook a bright tablecloth laughing and conversing." You need a comma after "tablecloth" because, at the moment, it reads that the tablecloth is doing the laughing and conversing.

When you have conversations and speeches, you need to start the dialogue with a capital letter. There are a number of times where you haven't done this. For example, "He continued, 'why were you folks in the alley?'" Also, you have a tendency to use run-on sentences, and these can be a little confusing. An example of this is, "'That's interesting,' seeing through Emily's reluctance to answer, 'well maybe it was looking for a better angle,' Porter waved his pencil at Gigi, 'after all how would the Auto-Cam know to protect your family?'" Here, I would start a new sentence with "Porter waved his pencil at Gigi" because that's not a dialogue tag. It is the start of a sentence.
I was temporarily confused at the beginning of this story. You have the paragraph explaining the background to Porter's mysterious cases, and then you show Porter speaking to a client. I wasn't sure if Porter was remembering this having happened earlier, or if he was now in the present tense having it happen. I would try to clarify that, if I were you.
You have some missed apostrophes. A few times, you have something like, "stores CCTV" when there should be an apostrophe before the S.
A more specific point. You end a paragraph like this, "couldn't quite put together;" It should be a period not a semicolon.