Residential Properties DO exist and are purchasable. This is a fact. If you watch the GTAO official trailer you will see that the narrator mentions that your friends will be able to visit your house and hang out with you.
The Dynasty 8 website is under maintenance for me as well so I guess it will remain that way till GTAO is live. Otherwise i will be happy to see it live in the next hours.
Bawsaq is a Social Club feature and therefore needs internet. It was offline for me as well for a couple of hours but generally it was available today. It does also work at the moment.