What percentage of expiring leases will renew their lease each month?

What percentage should I expect to put down? 

They take your loan and put it in a portfolio with a 1000 other loans.Then they sell it off with a predictable yield.If someone wants to refi/prepay, they just can't take that loan out of the portfolio, they need to replace it with something that gives the same yield.When there was a lower percentage of refi/prepays, they had sufficient reserves, however, at <3% rates they're getting all kinds of pre-pay/refi requests now.Not enough reserves means higher fees to increase them.

I paid a percentage of the profits for the private money and standard payments/payoff for the hard money loan.This is an effective structure to start.

First, typically in this kind of deal you're offer units rather than percentages.

It seems like a good deal percentage wise, but the rents are low.

If you need to use the rental income to qualify for the refinance then you would want to rent before you can refinance so you can show the lease in place.PMI can generally be removed when the LTV drops below 80% on the first mortgage. lenders will remove it automatically when you drop below a certain percentage but you may be able to request it to be removed sooner with certain verification.

Is their a standard,or close to,percentage rate related to closing costs?

They will loan you a percentage of the total cost or appraised value after the project is complete, whichever is less.

Not to mention the foreign immigrants who flock to Silicon Valley and pump, geez, billions more into our economy.As to the rest of your points: percentages absolutely matter.