You will want to find a bank that really knows how to do landlord-tenant accounts properly; from recent experience, I can tell you that TD Bank is not the bank to use for this (they have 1099'd interest to me rather than the tenant and nobody there knew how to fix that properly, and they also allow the account to go dormant when there is no activity and your security deposit accounts will probably be inactive most of the time).  

I will say that for someone who is looking to grow their portfolio over the coming 10+ years, I tend to take the view that the equity in my rentals is relatively dormant capital and if I can deploy it and a) not inhibit appreciation and b) generate even nominal incremental additional cash flow then using the HELOC to secure additional properties makes a lot of sense.  

They also have an option to join under a referral branch of the company where you still remain licensed but can make your license dormant temporarily if you are going through a period of time where you are focusing on investing more than selling and would rather not pay the high fees of the MLS. 

I would think right now that would equal a few 10 unit apartments, or maybe a couple 20-30 unit apartment buildings, which will limit the amount of work we need to do to manage, and limit the amount of dormant money in vacancies and evictions.

And if you do flipping, you might want to make the LLC dormant (or look into Series-LLC if that's an option for you).

@Serge S.These places in South America they had a downturn like 2001 , 2002 Prices started picking up in 2004 or 2005, and then in some places in 2009, others 2010, they went up like crazy iow they were dormant until they start the run up of prices, and you could see many signs of this recoveryYou would have made a fortune coming in ,almost any time, 2004 and up until NOWMy Grandma made 7 digitsIn Miami, we know that was different, after 2008 crash, Mexico also because the earthquake

Is it possible that the cheap-o cleaning got some dormant dog smell wet and all it really needs is to finish drying out again? 

Once mold is completely dry, it goes dormant.  

Michaela, I see this is an older post, but I thought it was time to wake it up from its dormant state.

Turns out it is VERY hard to prove who brought them in - apparently, the bedbugs can stay dormant for quite some time, so unless the tenant has lived there for 10 years, you may have a very hard time conclusively proving to a judge that they weren't there before the tenant moved in.