My assumption is that a "decent" prospective tenant will research comparative units in the area, so providing photos/video is a way of weeding out my competition.

The assumption you use will depend on a number of factors.

Simply put cap rates are commonly used for properties larger than 4 units. it is based on the assumption you paid cash for the property.

You can try to estimate increases in taxes going forward, but sometimes that can be difficult because it's based on assumptions.

My assumption is that I'm getting them under market value (based on zillow and city assessed values) and my numbers indicate that they'll both cashflow more than $200/month. 

I think it is better to focus on a very local area and specific rental property when assessing a rental property vs making broad assumptions on the rental"market." 

Please allow me to remind everyone that is an assumption that hasn't yet been corroborated as the last census was completed 10 years ago in 2010.

I make no assumptions about what you are doing, this is just general advice I have been sharing with eager investors lately. 

.- During its lifetime the investment produces some dividends and realized capital gains totaling 100% of the original investment (this is an assumption for the easy math, actual results may vary).- The Investment LLC distributes the proceeds as follows:   - Roth IRA gets $5K of the principal and $95K of the dividends/gains, totaling $100K;  - Traditional IRA gets $95K of the principal and $5K of the dividends/gains, also totalling $100K- If account owner decides to cash out and close all accounts at that point, they would get $170K in cash (assuming 30% tax rate and no penalty because of age over 59 1/2)Tax savings:- Traditional IRA that doubled from $100K to $200K: cash out value is $140K (30% tax on the entire balance).- Converting the whole initial amount of $100K to Roth would cost the investor $30K in taxes.  

Feel free to walk through your assumptions & numbers so far.