Bridging loans are offered on the value of the property and not the purchase price.
If you have a good agent, this will take far less time but you need to make sure you look at any properties you are considering to ensure they are right for you.
Zoning often changes; there may be new regulations or codes regarding the zoning, or the intended use could be limited to only a few uses that will hinder your intended project.
The interest rate is generally dependent on credit history, value of collateral placed and loan term.