Of course, you can do tax write off if you own investment property using Schedule E, but please consult with your CPA the best way to do this in your particular case. 

I am starting to build out a site to help with an agent's lead collection and online brand.

. § 1.469-5T(e)(3), the combined rental real estate activity is treated as a limited partnership interest of the taxpayer for purposes of determining material participation. 

Here are some of the highlights: quickly set up bank accounts for each property and sub-accounts under those for things like security deposits and CapEx; virtual credit cards tied to each property; quick transfer of funds; ability to send money back and forth to tenants (some platforms are for collection only but won't let you send your refundable deposits back to your tenants); easily categorize every transaction into IRS Schedule E categories for reporting taxes; ability to split transactions; tenant management from vetting to drafting lease agreements to collecting rent.

In the past, RentingFamilyMember has filed Schedule E and apportioned expenses by rental percentage, including mortgage interest and real estate taxes between Schedule E and Schedule A.

A follow up on this: do you all have mentors that you go to before making big R/E decisions? 

On Schedule E, I can see the rents received for each property along with the interest paid.  

Fast-forward one month to today, I still have heard no word from Philadelphia L&I (even after calling/e-mailing) and I'm ready to start renting it out, but one problem:"The Philadelphia Property Maintenance Code (Section PM-102.6.4) requires an owner offering residential property for rent to provide the following to the tenant at the inception of each tenancy:A Certificate of Rental Suitability issued by the Department of Licenses and Inspections no more than sixty (60) days prior to the inception of the tenancy.A copy of the “City of Philadelphia Partners for Good Housing” brochure issued by the Department of Licenses and Inspections....."

To give more content the side I'm currently in I've been renovating ( brand new everything) and once I finish in about 2-3 Months will be for rent for about $400 more than what they are paying now. 

If the rental is passive, you can probably muddle through Schedule E on your own.