I would think your pricing should depend on if the shop has exclusive rights to the image. If they want that, I would charge more, if you can use the images as well, then charge less. Non excluse rights, 10 images, I would charge based on the amount of time it took me to shoot them. If I took all 10 the same day (probably not possible) I would charge say $200 - that's maybe $20 an image. If I spent a week crawling around the city shooting 4 to 5 rolls to get 10 images, I would charge $400-$600. Exclusive rights would at least double the price, maybe triple. I personally wouldn't worry about contacting a private property owner after-the-fact. When I get caught, I offer an image as compensation. A caveate here - I don't make a living out of photography - but when someone wants my work, they pay what I consider a fair price. What is it worth to you to shoot what they want - that is the final price. Hope this helps -