conversions: 4-plex to offices how to approach

[John Gossett]

Hi, i recently saw an ad in Austin for a 4-plex in an area rezoned as light office. The building needs work (1969 build) and for the area they're asking too much for residential. But per SF office space ranges $4 to $20+. It's on a well traveled road. 2240 sf. Assuming only 2000 rentable sf and 4 offices at $4 per, it looks like at least $8000 gross per month.
Not having done this before, i would like to hear from this community how to approach this and how to execute the conversion. Assume either buy and hold or exchange into bigger opportunity.
In a year i would have decent amount to work a leveraged deal with $20+k for reno/ conversion work. Also, more info, my brother has been house renovating for >10 years and we would do the work. Is something like this viable for hard money lenders?

Thanks for your feedback