As stated above, one months fee for leasing is standard.

The upcharge fees are fairly standard in the PM business.

All REO’s have additional addendums to the standard contract.

Unlikely you will get caught but do you want to jeopardize your standard of living.

Figure out a standard professional fee for the different tasks that need done and charge those fees. 

My question is can I use my own standard lease form modified to reflect the major elements of the existing lease (assuming that the tenant is in agreement) or would I be better advised to keep the exact wording of the existing lease and just change the relevant names and dates?

Is this standard?

Limited & Standard. 

Most standard washers / dryers are ~27in on their minimum dimension, and the only doorframe to the room happens to be 26in wide.

Most of those loan products are stated income so there is no income verification 70% to 80% LTV is the standard for new purchases- (You did not mention credit but there will be credit score min requirements for these type of products)