Property ownership is public record. Right before escrow closes the title/escrow company records the name of the owner with the county recorders office. The "chain of title" can usually be traced back to the first owner.
The records are public and available a few weeks after close of escrow. No, you can not withhold the info however, you may mask the owner's name by purchasing as a trust or LLC. Of course you would need to set that up before going into contract.
These will be posted in the county tax records and there's no way to withhold this information. Typically these records are updated one a year, though some counties may process things more quickly. Certainly by January 1 of 2013 they will be available to the public online if they look. There are sites on the Internet (Zaba Search is one) that allow anyone interested to find out a tremendous amount about each of us. I'm not particularly a fan of having so much information public but I guess that's part of living in today's world.
Depending on the phase of the condo development, you should expect to see the public records on the buyer names and purchase prices in about 45-60 days after the close. If you would like to withhold that information, you can choose not to record the transaction within public records. But, you would need to pay all cash to have that option.