Replacing a faucet is a fairly quick and easy task for a plumber, but they'll charge one hour of time and sometimes there is a longer minimum for any service call. 

The landlord-tenant relationship is simply not all about bloodless logic and the simple exchange of money for a service or product.

Although I would primarily be in the business of wholesaling I’m also going to have my real estate license and I want to offer the services of listing homes and helping people find their dream homes or investment properties.

what services have you used in the past for these types of loans?

I prefer good service over saving 20 bucks a month.

When the time comes will use online services to market the units.

When I realized what happened, I called customer service and humbly inquired about whether they would be willing to extend the 0% interest promotion once more given my stellar payment history with the bank.

Typical service call is 60Bucks for me.

During your due diligence you'll want to back up the financials with one year's utility bills, copies of the service contracts, and a lease-file audit (comparing the leases to the rent roll).  

There are plenty of services you can subscribe to to get even better data than the MLS because they give you all sales, not just sales through the MLS.