Try to look for homes that have sold in the same area, with same square footage and beds/baths.

Get as close to the year built and square footage of your unit as you can.

There are now other houses currently available for rent in the area with the same number of beds and a similar sq footage.

Need footage taken for a project in North West Houston...

There are tons of responses for what to do when the appraisal comes back with a LOWER square footage figure vs. the advertised MLS listing, but what about the opposite case?

Square footage in relation to beds and bath for that neighborhood might be a potential tip-off to this.    

Eg: For a SFR, expenses such as mortgage interest and property taxes are split based upon square footage of the leased space.Keep your documents in the cloud and make sure your CPA has a secure portal for document sharing purposes.

Look for comps in the same area with same square footage that have sold in the last 3-6 months.

Question on estimating square footage for new construction. 

For SFH its squared footage / bedrooms / and area that help command price basically just like apartments.. harder to shop in person for comps so listings on major sites are easy to track by area / map Apartments basically the same way,, but transportation / bus sometimes is a big plus.. and if your in a close nitch with similar size apts I'd recommend go and physically check to see what they are offering,, shop them as I bet they have shopped you..