Sometimes other agents might know investors or mentors who are open to collaborating.Mixing in some local events and connecting online through BiggerPockets, Meetup, or LinkedIn can really help you expand your network.

DIY cost seg like room42.io can work for smaller residential properties, but commercial buildings with major rehabs are trickier.

I recommend using professionally engineered studies over DIY studies, in case of an audit. 

Hey BP,Networking has been one of the most important aspects of my real estate journey.

I think the best way is to build a solid contractor network and focus your own sweat equity on cosmetic value adds that do not need permits.Good luck!

I have been DIYing it for 2 years and it is becoming a money sponge.

I am based in LA and have a network of investors and buyers here in Los Angeles. 

DIY sprays rarely solve it long-term.

Quote from @Nikki Perry: Hello,Please tell me you are using a servicer and an attorney to handle this and that you are not DIYing it. 

This question was already answered recently by Michael here https://www.biggerpockets.com/forums/51/topics/1136752-expla...DIY Cost Seg or KBKG ($500 - $1,000)Engineering firm ($2,000 - $6,000)Michaels post explains difference btwn DIY vs Engineering firm.