The legacy ports on a SWM16 are apparently quite lossy. You would want to split the signals with a high frequency power passing splitter. The drawing you included is very old since it includes the 72.5* dish that hasn't been used in several years.
May I ask why you're using one dish per 13 apartments, instead of using a single dish and distributing the signal to all of them? It sounds like your roof would be covered with dishes! My first thought would be that maybe that's because you have multiple buildings and each one has 13 units, but you say the bottom floor is 70 ft from the dish, and units are up to 60 feet from the switch, so it sounds like it is certainly more than 13 units per building unless they are all penthouses.
There are products made to accomplish what you're trying to do. It seems like it would be a very good idea to hire someone with experience in this. If you really want to do it yourself, visit http://sonoradesign.com and plan on spending many hours reading the PDFs associated with each product they offer so you know what is out there and why they sell it.
They have products designed for exactly your sort of situation, and their product PDFs show examples of a dish on the roof of a high rise apartment building being amplified (and reamplified as necessary) with signal being tapped off at each floor serving chassis holding SWM8s or SWM16s that serve individual units. This stuff isn't exactly rocket science, but you'll need to learn a lot if you want to put together something yourself and expect it to work well.
Its certainly possible to have individual dishes serving small numbers of people to avoid buying that specialized equipment, but it seems like it would be a lot harder to maintain if there were problems and someone has to trace back what apartment is connected to what equipment, and what equipment is connected to what dish. Then going on the roof and hoping to figure out which dish is which (I guess you could paint "3rd floor SW" or something on them to keep them all straight ) Whichever way you choose if you do it yourself I hope you document it really well in case something breaks down while you're on vacation and someone else has to be called in to fix it!