Per the link:
"Investment interest is interest paid on money you borrowed that is allocable to property held for investment. It doesn't include any interest allocable to passive activities or to securities that generate tax-exempt income."
This is a passive activity. Additional, per the link at https://turbotax.intuit.com/tax-tips/investments-and-taxes/what-are-deductible-investment-interest-e...:
"For example, say you borrowed $20,000 to buy a 10 percent stake in a friend's car wash. That stake is certainly an investment, but unless you were there washing cars (or doing some other work), it's a passive activity, because you're not materially involved running the business. Thus, you couldn't deduct the interest on the $20,000 loan as investment interest. However, you could use the interest to offset income you received from the passive activity."
Therefore, this does not seem like it can be deducted as investment interest on Schedule A. Therefore, I am trying to directly offset it from my passive gain from the same activity.
