If you will be purchasing materials those cards offer some discounts and in addition you can get pro discounted pricing on larger orders as well.

3- what is the cost of materials?

.: There IS going to be a big impact on Real Estate, especially for Single Family and small Multi-Family that is Owner Occupied.The SALT Deductions are slated to expire at the end of 2025.Trump has already said that he will allow it to Expire:https://about.bgov.com/insights/elections/2025-tax-policy-cr...This is NOT a small change.The Standard Deduction gets reduced by about 40%.Then you get to deduct the SALT (State and Local Tax) that you paid PLUS up to $1 Million in Interest from your Mortgage against your Federal Tax Return.The only limiting factor will be AMT (Alternative Minimum Tax).In 2017 when this Cap was put into place, it made sense.However, now that the average Home sells for about Double what it was back in 2017, many normal Americans can benefit from the Expiration.I'm hoping that the Trump Administration does not extend the Cap.Too many people will love him more if he allows it to Expire!

I actually have two options for this property: 1) Rent out the existing 25 storage units AND rent out the building plus add the 25 additional units out of pocket.OR 2) Rent out the existing 25 storage units and added the 25 additional units out of pocket to rent them out BUT keep the metal building for my GC business to where we have offices and storage for building materials.

When we pointed it out to Hilany, she said that was due to getting people over there, coordinating assemblers, setting up the furniture, cleaning up and throwing away the material, etc.

But you will want to change the code for access right away as fired contractors can come back and take materials from you for other jobs.

Alternatively, you can offer more such as central air when the competition doesn't have it.Avoid areas with a lot of new rental deliveries.

Also what brand, material and carpet type should I get?   

I could alternatively put that down in a index fund for S&P that gets about 8-11%.  

Cons- depending on your personal financials, qualifying might be more challenging and the loan might not amortize over 30-years.Another alternative would be a business-purpose rehab loan (fix and flip/fix to rent).