Estimate downtime period, TI, and other market characteristics

[Steve Camp]

Hello, I am a multifamily investor and I would like to start acquiring retail real estate.

In order to properly underwrite deals I need to know the average downtime between leases if the previous tenant doesn't want to renew, to know the common lease terms in the market such as the number of free months, tenant improvements allowance, etc.

In multifamily I could find indicators in the Costar reports but in retail I don't know how to evaluate the downtime between leases, the only information I can find is the vacancy percentage.

How do retail investors estimate these numbers?

Thank you very much