I understand that may be the wrong question to ask as they obviously provide many other benefits than just saving on taxes but it seems to be the most quantifiable point to ask first. 

It was before ObamaCare, I was paying for my own family medical insurance running me about $2,000/month and I cannot deduct it on my personal taxes, and deducted it under the C Corp. as an employee benefit. 

They offer tremendous benefits including assisting with the DTI of low qualifying buyers by adding in the rental income to your gross income for multi-family properties.

Plus you will have all the same benefits from deductions perspective as LLC.

This would be an extensive and expensive project, but would benefit the city and community greatly. 

They may have a better product for you or be able to work some magic in your benefit.

That's really the only benefit I can think of because that's a great rate.

@Shaun R. there are several reasons but one primary factor could be the taxation status of the MGMT Co and any fringe benefits you may be looking to integrate

Ultimately the benefit of the credit line would be purchasing a second property, lower mtg payment, no PMI in exchange of another debt which interest rates will only increase through time...is this the right reasoning or did I miss the mark?

This is great advice, however, a cost seg will not be efficient on a single family home, the cost seg will likely cost you more than any benefit.