It doesn't help that interest rates are relatively high compared to the last few years and seem to be going up with the new inflation news and such. 

If your really needed it one could also consider hard money though that will come with higher rates and getting someone to give you 300k first time might be harder than just getting loan then you could refinance it later.Since your a high net worth person I would also try talking to local/regional and even big bank lenders.

When including maintenance/cap ex, vacancy, pm, misc he will have little, and possibly negative, cash flow.if he invested almost $250k to add less than $150k of value (assume some of the current value came from the home appreciation), there is no cash flow until the initial negative equity position is recovered.  

Choose a designer who understands what attracts high-paying guests and maximizes your revenue.2.

Quote from @Sean Spagnola: What renovations bring the highest after repair value?

Ideally you can provide something extra or unique that you can highlight in your photos and description to stand out. 

from those I know the way they got going was to buy a 4 plex when it went up in value sell and buy an 8 when it went up sell buy a 16  then a 40 then 100 extra and you need no partners.. you grow it organically. however of course this is not pay 40k and your instantly an apartment owner..

Commercial deals are going to look at your qualifications as an investor as well as the DSCR value of the property supporting itself (at least here in the USA).For construction, you will need to look into licensing requirements such as a GC license.

Most of the lenders I work with (provided you have experience and a credit score over 660) would do up to 85% of the purchase price and up to 100% of the rehab costs, provided this doesn't exceed 75% of the ARV.As for the idea of selling the land, great idea.

I am left to wonder, though some investors with SFR's are doing it successfully, is the risk too high for the reward?