The problem is no one book is going to be detailed enough for your specific state and county.Right here on BP there are lots of discussions about tax liens.

Let me know if you need help with specific tools or anything else.

Market Insights: Are there specific neighborhoods or property types in Philadelphia that I should target as a beginner?

Do you have specific numbers to share with the forum, particularly with respect to your in-laws house?

In US tax law, the depreciable lifespan of an asset is defined by its MACRS classification which stands for “Modified Accelerated Cost Recovery System.”Under MACRS, depreciable assets are assigned to different classes, with each class having a specific recovery period.

Speak with a CPA specific to real estate to get assistance.As others have mentioned, cost varies depending on location. 

And as far as legal—an attorney becomes essential once you're ready to finalize terms with either an HML or private lender to make sure everything’s secure.Hope this helps!

Quote from @Jeremy Jareckyj: Anything rented for longer than 30 days is legally considered a long-term rental.

Specifically STR build to rent. 

Just to name a few: Borrower's Experience FICO Loan Amount Loan Type being sought: Perm (30 yr ams), Bridge (12-36mo I/O), Rehab (12-36mo I/O), Ground Up (12-60mo I/O) Property Type (1-4 unit, 5+ MF, Warehouse/industrial, Hospitality etc)If you have a specific deal in mind, then you can have a lender (or broker) look at it and give you a better idea.