Most successful investor-friendly agents get their deals from multiple sources i.e. lead generation efforts; auctions; past clients; local network; active investors/wholesalers; other brokers; online marketing/advertising efforts; bandit signs; direct mail; etc - What do you require in order to take on a new client?

Part of me wants to self-manage, as I already manage other properties from out of state but this being a multi family and a sizeable building subject to onerous regulatory regime, and that I am time poor puts me off.

If the water bill is $100 a month, increase the price by 20% (or whatever you decide is fair) to compensate you for the time required to split and bill and to cover additional use when tenants squander the utility.

Fair Credit Reporting Act requires that you give them a copy of their credit report

The list of restrictions for each includes front, side, and rear yard setbacks, limits on the percentage of the lot that can be covered by the building, required parking, etc.If you want to put a duplex in a single family area, you may be able to do so - but first you'll need to get the property rezoned to permit that use.

That might require running your taxes. 

Lender requires the loss payee.

When it comes to reserve requirements for mortgages, it primarily depends on the purpose of the property.

This can cause issues with the re-installation as there may not be framing next to the window until after the weight pockets which could cause you to upsize the window leading to interior and exterior trim replacement as well as possible code enforcement issues as they may look at this as a change to the structure and require a structural inspection, even though you're still within the existing framing rough opening.

However, it's crucial to understand the requirements and responsibilities that come with being a Section 8 landlord to make an informed decision.