I purchased this using an FHA loan and the address listed on the loan is 1001. 

Question: Should I collateralize the loan (if using private or hard money), or rely on roll-over loans (to maximize the lower points and 3-4% rate)?

Investment loans generally carry high down-payments and costs.

Uncontested foreclosures move faster.Also - call the lender and apply for loan mod/forbearance etc.

You take policy loans.

I have ideas of the values, but nothing based on anything concrete.If I take out a construction loan, how do I pay for the construction loan during the process? 

DSCR recently came popular in the loan brokerage and private credit space with the rise of STRs and MTRs.Your local bank lenders will have the best rates typically.  

I have been doing these type of loans for 30 plus years and buying foreclosures since the late 70s.. seen it time and again  ..

When house hacking, consider the area's average rents, property values, and financing options, such as FHA loans or conventional loans, which may require as little as 3.5% down for multifamily properties (if it's owner-occupied).

Are there any asset backed loan products that lend in second position or any other forms of financing able to be collateralized by equity you can think of?