Generally if a first is going to be paid off from the second position foreclosure, then the first must be notified in the complaint and the language will not be indicative of the foreclosure being subject to the first.

We will use the high end of this range ($100k)   This implies the initial negative equity position is $150k  $150k (initial negative position)/$350 (cash flow) takes 428 months to recover the initial negative position (35 years).  

I'm curious why you want a HELOC instead of a conventional loan in the first position.

IMO this is much too little additional return to put your personal residence at risk.  

Additionally, young adults are living together with no intention of marriage.  

May affect your ability to work in the financial field, or in any managerial position of a company that’s raising venture capital8.

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

What does a cash positive investment mean to you? 

:Quote from @Jimmy Lieu:Have tons of examples of deals that hit the 1% rule and positive cash flow.