I currently use my Roth IRA for secured loans, and I've got some resources, if you'd like to connect!

Meetup.com is a good resource for those but some of the groups will also post here on Bigger Pockets Marketplace too.

Does anyone know if these same tools on here would be an effective resource for a commercial property analysis?

Here's a good resource: https://www.millionacres.com/r...

Does anyone have a resource/website that is free to use to estimate rents?

For rent accruing on August 1, 2021,or thereafter, and unless an exception or other state law allows for eviction, landlords areprohibited from serving or enforcing, or threatening to serve or enforce, any notice requiringa tenant to vacate any dwelling, including but not limited to an eviction notice, notice to payor vacate, unlawful detainer summons or complaint, notice of termination of rental, or noticeto comply or vacate, if, unless otherwise permitted by this order or under state law, a tenanthas (1) made full payment of rent; or (2) made a partial payment of rent based on theirindividual economic circumstances as negotiated with the landlord; or (3) has a pendingapplication for rental assistance that has not been fully processed; or (4) resides in ajurisdiction in which the rental assistance program is anticipating receipt of additional rentalassistance resources but has not yet started their program or the rental assistance program isnot yet accepting new applications for assistance.o There is a presumption that any rent payment made on or after August 1, 2021, isapplied to current rent before applying toward arrears.o A landlord is not required to accept partial payment of rent but is required to offer atenant a reasonable repayment plan under this order and pursuant to Section 4 ofE2SSB 5160.o A rental assistance program is authorized to share the application status of a tenantwith the tenant’s landlord.https://www.governor.wa.gov/si...

There are tons of resources on BP where you can find out more about driving for dollars, skip tracing, list buying, contracts, and wholesaling. 

In the past, I've found both to be good resources for information and referrals.

Especially if he is familiar with the commercial space, he sounds like he will be a fantastic resource to scale in that asset class sooner rather than later.  

I have a degree in natural resources and my job title is an Environmental Scientist.