As a commercial agent/tenant rep I always check:

Is the zoning correct for your client's use? 

Amps - how much power does the client need?

Ground level door? Is is big enough for client's use? Check condition of the roll up door and make sure it is secure. Check locks on all doors and security system.

Condition of the floor/floor coverings, wall. Steam clean carpets enough or replace throughout? Fresh paint?

Does your client need demised walls/offices?

What kind of lease is it? IG/MG - NNN? NNN charges per square foot?

Who pays for trash?

Ceiling foil - any evidence of leaks or foil needs to be replaced?

Check bathroom for any leaks, water pressure.

How many daily parking spaces does this lease allow?

Does your client needs overnight parking? Is it allowed on the property? Is the property fenced?

Be clear on the client's use and ask the leasing agent if use would be approved by landlord. Excessive noise or dust from client's work?

Ask the leasing agent what the commission split is between brokers on a completed transaction. Ask for a lease application.

If you want to partner on this I can write your LOI for you and help you negotiate terms on behalf of your client and go over every line in the commercial lease document.

In the last 6 months I've completed 20+ California commercial lease transactions. Feel free to contact me: annie@adhirealestate.com

GOOD LUCK!!

You should co-broker with an agent familiar with commercial leases or refer the client to such an agent since you do not seem to be familiar with warehouse / office leases.

How many restrooms, amenities, and what other types of businesses that are operating around it. How much parking, and does it have any "curb appeal" that is conducive to your clients type of business if he, or she needs such. Good luck!

Annie Adjchavanich nailed this one!

Annie Adjchavanich covered all my basics.

Well I do not get involved in commercial, but I would think you would want to look for any damages, things needing repair, etc. Keep a move-in checklist, perhaps with photos, to review with the landlord/agent for resolution before taking possession

As I'm not a commercial broker, I can't help you with this. Sorry.

Everything, like CAM etc etc etc

I would also try to negotiate tenant improvements and rent concessions.  

Don't do commercial, but looks like you got some great answers.

 Annie Adjchavanich covered all the bases!

Are you acting as an inspector or just making sure that what was specified for in the contract is still there?

 I would write down all of my clients questions and then go get the answers from someone who knows ....

Do what Annie says!  I've never done a commercial lease and learned a lot from her answer.

If you do not have experience doing it please ask your broker.

Millennials are not patient.  So I will be sure to explain the home buying process first, then walk them through the steps.  I will also communite with them by texting and emails, their preferred methods of communicating.

Annie Adjchavanich has an awesome answer!  I'd also check what Ron and Alexandra Seigel have to say.

Annie Adjchavanich nailed this one for you.

I would pay attention to your client.  As to the physical condition of the property, it's your client's opinion that counts.  He can hire an inspector to walk through with him if he wants more info.

I am not a commerical agent however Annie Adjchavanich has provided you with an comprehensive punch list.  

Jennie,

What Annie Adjchavanich said. 

Have you never done a commercial lease? You may want to think about co-brokering with an agent who has done them before you get yourself and your client in trouble

I'm just saying

Is this your final walkthru before closing? If so make sure the place is in the same condition as when you last looked at it and has the items included in the sale. You will also want to make sure any repairs that may have been requested were completed to the buyer's satisfaction. 

Jennie Leung Annie Adjchavanich has a good breakdown of due diligence items. I would add, have you completed a thorough review of the lease and had your client's attorney also review it for meeting your client's objectives. For the walk-through, I would check the mechanical, plumbing, electrical systems, etc.

Do you mean you're doing a walk-through? Or you're actually beginning research?
Annie gave you a decent list.
I would add to that, consider what your client's requirements are--not just now but projections. In other words, is the building going to work now and will it still work in 3-5 years or however long the lease is going to be?
Moving a business is expensive. With commercial leases, you want to make sure you stick the landing.

If you have not worked the commercial side, i would bring someone with me who has. It is a completely different product and starting with a ist of what the landlord is responsible for and what the tenant is responsible for. From HVAC, to lighting, walls, floor, ceiling, electric, loading dock, paving and such

Partner with Annie or someone else in your area that specializes in commercial real estate.

Who is paying for what when it comes to repairs?

No commercial experience here.

it looks like Annie Adjchavanich gave you some good guidance with that...

Make sure you understand the needs of your client.