My best advice is to work with a realtor who is also an investor and can easily plug you in with their systems and network of GCs, PMs, and lenders.

If you include the time waiting for your application to be approved, it could easily be 2 years.These timelines keep getting stretched out.

With that, based on your numbers, I think you should go for a HELOC and I think you should easily qualify for up to $700K as HELOC limit.

Is there a program or software that allows you to easily observe all the properties in your portfolio, as well as their details?

You could easily lose more in rent not to mention headaches and end up with a worse result. 

a low appraisal could easily wipe that out.Yup.

Goes in fairly easily and is cheaper than carpet by far.

Hows it the biggest change to the industry in a century...when literally 25 years ago the MLS was not on the internet, and thus commissions not easily discernible from going to an online MLS.Literally we are just going back to something that existed in the industry not that long ago.

Otherwise the corporate veil can easily be pierced as others have mentioned.

When I talked to an experienced contractor and a friend, he told me that would be easily visible during a proper home inspection.