Id also like to be able to list key data like absorption rate.We are flippers.  

A TT fee (telegraphic bank transfer) is usually around £22.50 but some banks will charge more or less for it.What the aggregators do, or the people who run the comparison sites, is to provide the solicitor with a matrix of costs and bandings to apply to house prices within certain price bands and the costs and fees are normally applied from accessing the matrix data to generate your online quote.

I prefer a predictable outcome supported by solid data analysis.

I assume insurance companies analyze this data all the time.

The house was likely also shown on zillow and realtor.com so the data is public records.

While you assert without any evidence (okay a single data point) that leases are "soaring", there has been evidence brought to this forum numerous times that there is an oversupply of high-end apartments coming on line this year. 

I've tried to research Allentown's population growth and patterns, and gotten mixed data.

You can find more details here (note that the figures are quite old from this link, so Jon S. must have a more recent post or data to compile  https://www.extension.harvard.edu/inside-extension/how-use-real-estate-trends-predict-next-housing-bubbleInteresting theory.

The building is 75 years old so you have to know if there is any major deferred maintenance.Last but not least, it is advertised as 12 units and LoopNet's property data says it's six units, so you need to make sure they have not been split in half without proper zoning and permits.Guess that's it for my ruminations!

Click Here for DFW Housing Data, from TAMU Real Estate Center for Market Research