A good bit of vertical integration (yay business school terms!)

It also grows with you quite nicely over time as well, as your business expands and you need more features, automation, and integration with other systems for mailing, texting, eSignature, etc.There are a couple of free REI app packs available that you might want to install to get started:https://podio.com/market/packs/101053-rei-quickstarthttps://podio.com/market/packs/117687-real-estate-investor-pack-by-slc 

Integrity matters and always wins out in the end.

Android is one imitator that outdid the original.You can run multiple apps, integrates seamlessly with google, most apps are free.I have to agree with Zillow, Pandora, and iheartradio.

The garage went from having a small leak to having structural integrity issues and the unfinished garage walls suddenly needed sheetrocking because of exposed wiring.

That being said, I don't think it would be an issue maintaining your existing real estate portfolio as separate as long as you are careful to maintain those asset's integrity as separate assets.  

Look at it this way, there are many sidewinder bankers, just a crooked in their dealings and the FDIC regulates them, much can go unchecked, so you need to do your due diligence, check with other borrowers, look at how many foreclosures they have done, se what their lending activity is before you judge a foreclosure rate, ask others in RE, check the integrity of the person and the company.

Some custodians have more extensive experience than others, and because the custodian is an entity that deals with the integrity of the account, it makes sense to look for one who is good at it. 

If we do, you can be certain there will be some vertical integration effort.

There are a lot of of different tactics you will need to implement in order to give it the best opportunity to get the results you are looking for plus a few tactics of my own I integrated that worked out pretty well.