I should note that includes two furnace filters, which by themselves would cost $50-100. 

Quote from @Kelsey Vander Meulen: RentRedi includes the ability for tenants to submit a maintenance request.

I am working on a product that will help small-medium size landlords launch and maintain Internet presence at a small monthly cost without spending big budget on custom development.It will include: SEO, custom domain, direct syncing with your property management software, syncing with QB. 

Often times, counter venders will run deals with sinks included.  

I'm working on purchasing a unique property that includes a small home on 20+ acres. 

Making contacts including HML, contractors, RAs and Property Managers.

I'll look into the flood risk and I'm always getting an inspection which includes a foundation check.  

Additionally, the Courthouse Online platform is a helpful tool for property assessment data, including ownership and sale history; you’ll just need your property’s Control Number to get started.The Property Mapper is great for visuals, but it sometimes lags with the latest updates, so checking with the Recorder of Deeds or using Courthouse Online will give you the most accurate information.

COSTS:  I would look at any-and-all things needed to run an STR including items that are often done by owners--for example, property management.  

I think that you are missing a few big ones including Zumper, homes, and a bunch of others.