New students start looking as soon as they are accepted to the local universities so he may sign some up early or put them on a list to contact when he confirms the seniors do not wish to renew after graduation.

I imagine when senior citizens are retired, they care more about what is for sure coming in every month compared to how much money is sitting in the bank.  

This is where I can create units available to; section 8, senior citizens & disabled individuals.

That will put you right on top of the number you'll need to know.Since this is a Multi, you don't need to watch out for the homestead exemptions or senior citizen exemptions like you do with SFR.  

The city will not go after seniors who cannot pay their taxes as long a s they remain living in the house, but once they move out or pass...the money is due.

If redemption during the second twelve months, you will receive your principal plus 50%.After 2 years the right of redemption expires and you should be able to obtain title insurance on the property, IF all lien holders were properly notified by the legal firm representing the taxing authorities, and if the tax lien foreclosed on was senior to all other liens.

Your question(s) concern the perspective of a junior lien holder as to how s/he is affected when senior mortgage goes to foreclosure sale.Generally, Junior lien holders are "wiped off" but the debt is not wiped out and remains, but unsecured.As a junior lien holder, remedies include:1) advancing funds to cure first mortgage in order to protect position;2) hoping for a forced sale that generates sufficient surplus (overbid) funds to pay junior debt;3) litigation to set aside sale due to claim of deficient noticing to junior bene (lien holder)Junior lien holders' claims for over bids are typically "pro-tanto" in nature, in that they are paid according to order of recordation, absent subordination agreement that would change order of lien position.If you are considering investing in junior trust deeds or mortgages, be sure to study title laws specific to the state(s) you are considering buying notes in.  

If there health forces them to sell, they most likely will move in with family or an assisted living situation.That being said, it is probably a good market for investment buying but I wouldn't rely heavily on the strategy of senior renting.

I need a lot more information to answer your question.I would imagine that you're going to need cash as U.S. banks will non-lend to non-citizen. 

It's very "Apple-like" in terms of functionality which makes sense because the founder of Nest was a former Senior President at Apple and played a role in iPod and iPhone development.