If you were limited in cash reserves atleast you'll have the HELOC as a 2nd or 3rd back up source of funds to weather storms.

I've only had one listing transaction from my BP leads.Most are complete noobs or have limited REI experience with a rental or two.

These properties appeal to students and low-income renters, especially if traditional housing is limited.

I would recommend considering conventional financing until you reach Fannie Mae's limit of 10 properties, then consider either a portfolio loan, and start your race to 10 again, or look at DSCR at that time. 

I'd be looking at multiple structures. we try to build below the average new build cost in our market in Columbus Ohio which is 515,000 last year and we target land 40-50k and urban core adjacent where we get higher price per square foot. we build for clients with margin around $190 a sq ft depending on multi or single. we can get that down in our triplex it's a little higher on our single family homes because of garages and limited economies of scale. hope that helps. idk Philly but if you show me the area and styles of homes I can give you some more insights. 

You don't have to do anything with the money and there's no time limits or anything.2.

It gives you the flexibility kind of like a credit card that allows you to borrow a certain limit and withdraw funds as needed.

I am new to biggerpockets.com so forgive me if this has been discussed already but, does the brrrr method work when working multifamily and if so can someone send me a case study or what the difference is 

The loss created by section 179 is limited to your total net taxable income amount from all "active" business income you have, plus any W-2 income. 

Im new to the investing world and am still in the early stages, I've been studying and researching for the past five years.