issues like migrating demographic groups can impact negatively on your apt complex as well right?

If you find your list is growing very large, you might consider migrating to something like Salesforce.com or Zoho.2) I strongly recommend you hire a company to this.

Note the properties I'm looking at are in Greenville but I'll tell you for sure that as of now since NYC is too expensive everyone is migrating to jersey city since it's so close so opportunity is in abundance especially for flippers! 

i grew up 3 hours north of milwaukee, but migrated west. the fact you're choosing to invest in income producing RE (vs say a cool sports car), is certainly what will get you closer to your goals more quickly.my 2 pennies...SFH vs multifamily: could be debated either way.

There seems to be a definite cycle where residents will migrate in and out of the area.

So can job losses and out-migration.

As boomers migrate down from the cold belt states it keeps fueling growth.

Typically the security deposit, which technically belongs to the tenant but is pledged as security that they will uphold their lease obligations, migrates to the new landlord.  

However, you have a wide jobs base, a lot of in-migration for weather and jobs, and a wide base of industry in SA. 

Everything else aside, Sacramento is supposed to be one of the best areas to purchase because of the mass genertrification and migration of Bay residents to a more affordable market.