I helped write the ASTM E2018 Standard for Property Condition Assessments (see the ASTM web site to buy a copy for a few dollars).

I simply want a web based system to store docs, have a tenant portal, handle service requests and perform accounting.  

Your broker will also hook you up with lenders, title companies, inspectors, contractors, web marketing, signage, camera advice, etc. etc. etc...   

I love, love, Marion County's willingness to put all sorts of property related info on the web.

There is a lot of good and useful information on their web site, so I recommend reading it all.

Oh what a tangled web we weave when first we practice to deceive''.

You also can find out by way of the web the local real estate companies.

This is my opinion but if you are going to enter the web space as a means for lead generation then either go all in or don't bother.  

Get brokers to provide you with market cap and price per unit ranges for the class of property you are targeting, analyze a bunch of OMs (from broker's web sites, email blasts, and loopnet) and network with multifamily investors and you will learn the market.

 I use a larger ticket system that is segmented for each client, so it is a bit of overkill for 95% of folksI asked my web guy (aka my 14yr old son) to email what we use now (he "oversees" most of my real estate clients due to conflict of interest with my day job)...